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3 | <meta http-equiv="CONTENT-TYPE" content="text/html; charset=windows-1252"><title>PALM |
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4 | chapter 3.5.5</title> <meta name="GENERATOR" content="StarOffice 7 (Win32)"> <meta name="AUTHOR" content="Siegfried Raasch"> <meta name="CREATED" content="20040802;14050943"> <meta name="CHANGED" content="20041117;12180008"> <meta name="KEYWORDS" content="parallel LES model"> <style> |
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9 | <body style="direction: ltr;" lang="en-US"><h3 style="line-height: 100%;"><font size="4">3.5.4 |
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10 | User-defined output quantities<br> |
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11 | </font></h3>A very typical request of users is the |
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12 | calculation and |
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13 | output of |
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14 | quantities which are not part of PALM's standard output. The basic user |
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15 | interface includes a number of subroutines which allow the calculation |
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16 | of user-defined quantities and output of these quantities as 2d cross |
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17 | section or 3d volume data. The respective subroutines |
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18 | contain as |
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19 | an example code lines (written as comment lines) for calculating and |
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20 | output the square of the u-component velocity (note: this quantity |
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21 | could of course easily be calculated from the u-component by |
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22 | postprocessing the PALM output so that calculation within PALM is not |
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23 | necessarily required).<br><br>The |
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24 | rest of this chapter explains step-by-step how to modify/extend the |
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25 | default file user_interface.f90 in order to generate output of the |
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26 | quantity "square of the u-component". If more than one user-defined |
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27 | quantity shall be output, these steps have to be carried out in the |
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28 | same way for each of the quantities.<br><br><ol><li>The |
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29 | quantity has to be given a unique string identifier, e.g. <span style="font-style: italic;">'u2'</span>. |
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30 | This identifier must be different from the identifiers used for the |
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31 | PALM standard output (see list in description of parameter <a href="chapter_4.2.html#data_output">data_output</a>). |
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32 | To switch on output of this quantity, the user has to assign the string |
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33 | identifier to the parameter <a href="chapter_4.3.html#data_output_user">data_output_user</a>, |
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34 | eg.:<br><br><span style="font-family: monospace;"> |
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35 | data_output_user</span> = <span style="font-style: italic;">'u2'</span>, <span style="font-style: italic;"> 'u2_xy_av'</span><br><br>The |
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36 | pure string <span style="font-style: italic;">'u2'</span> |
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37 | switches on the output of instantaneous 3d volume data. Output of cross |
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38 | section data and time averaged data is switched on by additionally |
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39 | appending the strings <span style="font-style: italic;">'_xy'</span>, |
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40 | <span style="font-style: italic;">'_xz'</span>, <span style="font-style: italic;">'_yz'</span>, and/or <span style="font-style: italic;">'_av'</span> (for a |
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41 | detailed explanation see parameter <a href="chapter_4.2.html#data_output">data_output</a>).<br><br></li><li>In |
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42 | order to store the quantities' grid point data within PALM, a 3d data |
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43 | array has to be declared in module <a href="chapter_3.5.1.html#user"><span style="font-family: monospace;">user</span></a>:<br><br><span style="font-family: monospace;"> REAL, |
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44 | DIMENSION(:,:,:), ALLOCATABLE :: u2, u2_av</span><br><br>The |
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45 | second array <span style="font-family: monospace;">u2_av</span> |
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46 | is needed in case that output of time averaged data is requested. It is |
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47 | used to store the sum of the data of the respective time levels over |
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48 | which the average has to be carried out.<br><br><br></li><li>The |
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49 | data array has to be allocated in subroutine <a href="chapter_3.5.1.html#user_init"><span style="font-family: monospace;">user_init</span></a>:<br><br><span style="font-family: monospace;"> |
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50 | ALLOCATE( u2(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1) )</span><br><br>In |
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51 | case that output of time averaged data is requested, the array |
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52 | containing the sum has possibly to be read from the restart file (local |
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53 | filename <a href="chapter_3.4.html#BININ">BININ</a>) |
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54 | by executing the following code in <span style="font-family: monospace;">user_init</span>:<br><br><span style="font-family: monospace;"> |
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55 | IF ( initializing_actions == 'read_restart_data' ) |
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56 | THEN</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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57 | READ ( 13 ) field_chr</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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58 | DO WHILE ( TRIM( field_chr ) /= '*** end |
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59 | user ***' )</span><br style="font-family: monospace;"><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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60 | SELECT CASE ( TRIM( field_chr ) )</span><br style="font-family: monospace;"><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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61 | CASE ( 'u2_av' )</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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62 | ALLOCATE( |
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63 | u2_av(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1) )</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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64 | READ ( 13 ) u2_av</span><br style="font-family: monospace;"><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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65 | CASE DEFAULT</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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66 | PRINT*, |
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67 | '+++ user_init: unknown |
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68 | variable named "', &</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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69 | |
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70 | |
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71 | TRIM( |
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72 | field_chr ), '" found in'</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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73 | PRINT*, |
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74 | ' |
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75 | data from prior run on PE ', myid</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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76 | |
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77 | CALL local_stop</span><br style="font-family: monospace;"><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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78 | END SELECT<br> |
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79 | ENDDO</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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80 | ENDIF</span><br style="font-family: monospace;"><br><br></li><li>The |
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81 | quantity has to be given a unit (subroutine <a href="chapter_3.5.1.html#user_check_data_output"><span style="font-family: monospace;">user_check_data_output</span></a>):<br><br><span style="font-family: monospace;"> CASE ( |
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82 | 'u2' )</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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83 | unit = 'm2/s2'</span><br> <br>Otherwise, |
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84 | PALM will abort.<br><br><br></li><li>The |
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85 | vertical grid on which the quantity is defined (given by the levels |
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86 | 'zu' or 'zw', on which the u- or w-component of the velocity are |
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87 | defined) has to be specified for the NetCDF output files in subroutine <a href="chapter_3.5.1.html#user_define_netcdf_grid"><span style="font-family: monospace;">user_define_netcdf_grid</span></a>:<br><br><span style="font-family: monospace;"> |
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88 | CASE ( 'u2', 'u2_xy', 'u2_xz', 'u2_yz' )</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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89 | grid = 'zu'</span><br> <br>As |
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90 | the example shows, this grid has to be defined for the 3d volume data |
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91 | as well as for all of the three cross sections.<br><span style="font-family: monospace;"><br><br></span></li><li>After |
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92 | each timestep, the quantity has to be calculated at all gridpoints and |
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93 | to be stored. This has to be done in subroutine <a href="chapter_3.5.1#user_actions"><span style="font-family: monospace;">user_actions</span></a> |
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94 | at location 'after_integration':<br><br><span style="font-family: monospace;"> CASE |
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95 | ( 'after_integration' )</span><br style="font-family: monospace;"><span style="font-family: monospace;">!</span><br style="font-family: monospace;"><span style="font-family: monospace;">!-- |
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96 | Enter actions to be done after every time integration (before</span><br style="font-family: monospace;"><span style="font-family: monospace;">!-- |
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97 | data output)</span><br style="font-family: monospace;"><span style="font-family: monospace;">!-- |
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98 | Sample for user-defined output:</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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99 | DO i = nxl-1, nxr+1</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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100 | DO j = nys-1, nyn+1</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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101 | DO k = nzb, nzt+1</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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102 | u2(k,j,i) = u(k,j,i)**2</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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103 | ENDDO</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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104 | ENDDO</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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105 | ENDDO</span><br><br> <br></li><li>In |
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106 | case that output of time-averaged data is requested, the sum- and |
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107 | average-operations as well as the allocation of the sum-array have to |
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108 | be carried out in subroutine <a href="chapter_3.5.1.html#user_3d_data_averaging"><span style="font-family: monospace;">user_3d_data_averaging</span></a>:<br><br><span style="font-family: monospace;"> |
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109 | IF ( mode == 'allocate' ) THEN<br> |
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110 | ...</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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111 | CASE ( 'u2' )</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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112 | IF ( .NOT. ALLOCATED( u2_av ) ) THEN</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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113 | ALLOCATE( u2_av(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1) )</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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114 | ENDIF</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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115 | u2_av = 0.0<br> ...</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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116 | ELSEIF ( mode == 'sum' ) THEN<br> |
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117 | ...</span><br style="font-family: monospace;"><span style="font-family: monospace;"> CASE |
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118 | ( 'u2' )</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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119 | DO i = nxl-1, nxr+1</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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120 | DO j = nys-1, nyn+1</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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121 | DO k = nzb, nzt+1</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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122 | u2_av(k,j,i) = u2_av(k,j,i) + u2(k,j,i)</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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123 | ENDDO</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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124 | ENDDO</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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125 | ENDDO<br> ...</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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126 | ELSEIF ( mode == 'average' ) THEN<br> |
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127 | ...</span><br style="font-family: monospace;"><span style="font-family: monospace;"> CASE |
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128 | ( 'u2' )</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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129 | DO i = nxl-1, nxr+1</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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130 | DO j = nys-1, nyn+1</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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131 | DO k = nzb, nzt+1</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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132 | u2_av(k,j,i) = u2_av(k,j,i) / REAL( average_count_3d )</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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133 | ENDDO</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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134 | ENDDO</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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135 | ENDDO</span><br><br> </li><li>For |
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136 | output of 2d cross sections, the gridpoint data of the quantity has to |
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137 | be resorted to array <span style="font-family: monospace;">local_pf</span> |
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138 | in subroutine <a href="chapter_3.5.1.html#user_data_output_2d"><span style="font-family: monospace;">user_data_output_2d</span></a>. |
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139 | Also the vertical grid, on which the quantity is defined, has to be set |
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140 | again:<br><br><span style="font-family: monospace;"> CASE |
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141 | ( 'u2_xy', 'u2_xz', 'u2_yz' )</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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142 | IF ( av == 0 ) THEN</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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143 | DO i = nxl-1, nxr+1</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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144 | DO j = nys-1, nyn+1</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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145 | DO k = nzb, nzt+1</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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146 | local_pf(i,j,k) = u2(k,j,i)</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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147 | ENDDO</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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148 | ENDDO</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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149 | ENDDO</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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150 | ELSE</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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151 | DO i = nxl-1, nxr+1</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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152 | DO j = nys-1, nyn+1</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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153 | DO k = nzb, nzt+1</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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154 | local_pf(i,j,k) = u2_av(k,j,i)</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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155 | ENDDO</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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156 | ENDDO</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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157 | ENDDO</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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158 | ENDIF</span><br style="font-family: monospace;"><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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159 | grid = 'zu'</span><br> <br>The <span style="font-family: monospace;">ELSE</span> case is |
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160 | only needed in case that output of time-averaged data is requested.<br><br><br></li><li>For |
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161 | output of 3d volume data, the gridpoint data of the quantity has to be |
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162 | resorted to array <span style="font-family: monospace;">local_pf</span> |
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163 | in subroutine <a href="chapter_3.5.1.html#user_data_output_3d"><span style="font-family: monospace;">user_data_output_3d</span></a>. |
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164 | Also the vertical grid, on which the quantity is defined, has to be set |
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165 | again:<br><br><span style="font-family: monospace;"> CASE |
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166 | ( 'u2' )</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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167 | IF ( av == 0 ) THEN</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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168 | DO i = nxl-1, nxr+1</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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169 | DO j = nys-1, nyn+1</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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170 | DO k = nzb, nz_do</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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171 | local_pf(i,j,k) = u2(k,j,i)</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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172 | ENDDO</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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173 | ENDDO</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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174 | ENDDO</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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175 | ELSE</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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176 | DO i = nxl-1, nxr+1</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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177 | DO j = nys-1, nyn+1</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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178 | DO k = nzb, nz_do</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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179 | local_pf(i,j,k) = u2_av(k,j,i)</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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180 | ENDDO</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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181 | ENDDO</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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182 | ENDDO</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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183 | ENDIF</span><br style="font-family: monospace;"><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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184 | grid = 'zu'</span><br><br>The <span style="font-family: monospace;">ELSE</span> case is |
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185 | only needed in case that output of time-averaged data is requested.<br><br><br></li><li>In |
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186 | case of job chains, the sum array has to be written to the (binary) |
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187 | restart file (local filename <a href="chapter_3.4.html#BINOUT">BINOUT</a>) |
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188 | in subroutine <a href="chapter_3.5.1.html#user_last_actions"><span style="font-family: monospace;">user_last_actions</span></a>:<br><br><span style="font-family: monospace;"> |
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189 | IF ( ALLOCATED( u2_av ) ) THEN</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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190 | WRITE ( 14 ) |
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191 | 'u2_av |
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192 | '; WRITE ( 14 ) u2_av</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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193 | ENDIF</span><br><br>Otherwise, the calculated |
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194 | time-average may be wrong. </li></ol><hr> |
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195 | <p style="line-height: 100%;"><br><font color="#000080"><font color="#000080"><a href="chapter_3.5.3.html"><font color="#000080"><img src="left.gif" name="Grafik1" align="bottom" border="2" height="32" width="32"></font></a><a href="index.html"><font color="#000080"><img src="up.gif" name="Grafik2" align="bottom" border="2" height="32" width="32"></font></a><a href="chapter_3.5.5.html"><font color="#000080"><img style="border: 2px solid ; width: 32px; height: 32px;" alt="" src="right.gif" name="Grafik3"></font></a></font></font></p> |
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196 | <p style="line-height: 100%;"><i>Last |
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197 | change: </i> $Id: chapter_3.5.4.html 62 2007-03-13 02:52:40Z weinreis $</p> |
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198 | </body></html> |
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