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| 5 | <title>PALM chapter 3.5.5</title><meta name="GENERATOR" content="StarOffice 7 (Win32)"> |
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| 6 | <meta name="AUTHOR" content="Siegfried Raasch"> |
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| 16 | <h3 style="line-height: 100%;"><font size="4">3.5.4 User-defined output quantities<br> |
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| 17 | </font></h3>A very typical request of users is the calculation and |
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| 18 | output of |
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| 19 | quantities which are not part of PALM's standard output. The basic user |
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| 20 | interface includes a number of subroutines which allow the calculation |
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| 21 | of user-defined quantities and output of these quantities as 2d cross |
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| 22 | section or 3d volume data. The respective subroutines contain as |
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| 23 | an example code lines (written as comment lines) for calculating and |
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| 24 | output the square of the u-component velocity (note: this quantity |
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| 25 | could of course easily be calculated from the u-component by |
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| 26 | postprocessing the PALM output so that calculation within PALM is not |
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| 27 | necessarily required).<br><br>The |
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| 28 | rest of this chapter explains step-by-step how to modify/extend the |
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| 29 | default file user_interface.f90 in order to generate output of the |
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| 30 | quantity "square of the u-component". If more than one user-defined |
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| 31 | quantity shall be output, these steps have to be carried out in the |
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| 32 | same way for each of the quantities.<br><br><ol><li>The quantity has to be given a unique string identifier, e.g. <span style="font-style: italic;">'u2'</span>. |
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| 33 | This identifier must be different from the identifiers used for the |
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| 34 | PALM standard output (see list in description of parameter <a href="chapter_4.2.html#data_output">data_output</a>). To switch on output of this quantity, the user has to assign the string identifier to the parameter <a href="chapter_4.3.html#data_output_user">data_output_user</a>, eg.:<br><br><span style="font-family: monospace;"> data_output_user</span> = <span style="font-style: italic;">'u2'</span>, <span style="font-style: italic;"> 'u2_xy_av'</span><br><br>The pure string <span style="font-style: italic;">'u2'</span> |
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| 35 | switches on the output of instantaneous 3d volume data. Output of cross |
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| 36 | section data and time averaged data is switched on by additionally |
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| 37 | appending the strings <span style="font-style: italic;">'_xy'</span>, <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 detailed explanation see parameter <a href="chapter_4.2.html#data_output">data_output</a>).<br><br></li><li>In order to store the quantities' grid point data within PALM, a 3d data 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, DIMENSION(:,:,:), ALLOCATABLE :: u2, u2_av</span><br><br>The second array <span style="font-family: monospace;">u2_av</span> |
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| 38 | is needed in case that output of time averaged data is requested. It is |
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| 39 | used to store the sum of the data of the respective time levels over |
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| 40 | which the average has to be carried out.<br><br><br></li><li>The 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;"> ALLOCATE( u2(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1) )</span><br><br>In |
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| 41 | case that output of time averaged data is requested, the array |
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| 42 | containing the sum has possibly to be read from the restart file (local |
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| 43 | filename <a href="chapter_3.4.html#BININ">BININ</a>) by executing the following code in <span style="font-family: monospace;">user_init</span>:<br><br><span style="font-family: monospace;"> IF ( initializing_actions == 'read_restart_data' ) THEN</span><br style="font-family: monospace;"><span style="font-family: monospace;"> READ ( 13 ) field_chr</span><br style="font-family: monospace;"><span style="font-family: monospace;"> DO WHILE ( TRIM( field_chr ) /= '*** end user ***' )</span><br style="font-family: monospace;"><br style="font-family: monospace;"><span style="font-family: monospace;"> SELECT CASE ( TRIM( field_chr ) )</span><br style="font-family: monospace;"><br style="font-family: monospace;"><span style="font-family: monospace;"> CASE ( 'u2_av' )</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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| 44 | 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;"> READ ( 13 ) u2_av</span><br style="font-family: monospace;"><br style="font-family: monospace;"><span style="font-family: monospace;"> CASE DEFAULT</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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| 45 | PRINT*, '+++ user_init: unknown |
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| 46 | variable named "', &</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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| 47 | |
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| 48 | TRIM( |
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| 49 | field_chr ), '" found in'</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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| 50 | PRINT*, |
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| 51 | ' |
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| 52 | data from prior run on PE ', myid</span><br style="font-family: monospace;"><span style="font-family: monospace;"> CALL local_stop</span><br style="font-family: monospace;"><br style="font-family: monospace;"><span style="font-family: monospace;"> END SELECT<br> ENDDO</span><br style="font-family: monospace;"><span style="font-family: monospace;"> ENDIF</span><br style="font-family: monospace;"><br><br></li><li>The 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 ( 'u2' )</span><br style="font-family: monospace;"><span style="font-family: monospace;"> unit = 'm2/s2'</span><br> <br>Otherwise, PALM will abort.<br><br><br></li><li>The |
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| 53 | vertical grid on which the quantity is defined (given by the levels |
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| 54 | 'zu' or 'zw', on which the u- or w-component of the velocity are |
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| 55 | 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;"> CASE ( 'u2', 'u2_xy', 'u2_xz', 'u2_yz' )</span><br style="font-family: monospace;"><span style="font-family: monospace;"> grid = 'zu'</span><br> <br>As the example shows, this grid has to be defined for the 3d volume data as well as for all of the three cross sections.<br><span style="font-family: monospace;"><br><br></span></li><li>After each timestep, the quantity has to be calculated at all gridpoints and 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> at location 'after_integration':<br><br><span style="font-family: monospace;"> CASE ( 'after_integration' )</span><br style="font-family: monospace;"><span style="font-family: monospace;">!</span><br style="font-family: monospace;"><span style="font-family: monospace;">!-- Enter actions to be done after every time integration (before</span><br style="font-family: monospace;"><span style="font-family: monospace;">!-- data output)</span><br style="font-family: monospace;"><span style="font-family: monospace;">!-- Sample for user-defined output:</span><br style="font-family: monospace;"><span style="font-family: monospace;"> DO i = nxl-1, nxr+1</span><br style="font-family: monospace;"><span style="font-family: monospace;"> DO j = nys-1, nyn+1</span><br style="font-family: monospace;"><span style="font-family: monospace;"> DO k = nzb, nzt+1</span><br style="font-family: monospace;"><span style="font-family: monospace;"> u2(k,j,i) = u(k,j,i)**2</span><br style="font-family: monospace;"><span style="font-family: monospace;"> ENDDO</span><br style="font-family: monospace;"><span style="font-family: monospace;"> ENDDO</span><br style="font-family: monospace;"><span style="font-family: monospace;"> ENDDO</span><br><br> <br></li><li>In |
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| 56 | case that output of time-averaged data is requested, the sum- and |
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| 57 | average-operations as well as the allocation of the sum-array have to |
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| 58 | 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;"> IF ( mode == 'allocate' ) THEN<br> ...</span><br style="font-family: monospace;"><span style="font-family: monospace;"> CASE ( 'u2' )</span><br style="font-family: monospace;"><span style="font-family: monospace;"> IF ( .NOT. ALLOCATED( u2_av ) ) THEN</span><br style="font-family: monospace;"><span style="font-family: monospace;"> 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;"> ENDIF</span><br style="font-family: monospace;"><span style="font-family: monospace;"> u2_av = 0.0<br> ...</span><br style="font-family: monospace;"><span style="font-family: monospace;"> ELSEIF ( mode == 'sum' ) THEN<br> ...</span><br style="font-family: monospace;"><span style="font-family: monospace;"> CASE ( 'u2' )</span><br style="font-family: monospace;"><span style="font-family: monospace;"> DO i = nxl-1, nxr+1</span><br style="font-family: monospace;"><span style="font-family: monospace;"> DO j = nys-1, nyn+1</span><br style="font-family: monospace;"><span style="font-family: monospace;"> DO k = nzb, nzt+1</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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| 59 | 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;"> ENDDO</span><br style="font-family: monospace;"><span style="font-family: monospace;"> ENDDO</span><br style="font-family: monospace;"><span style="font-family: monospace;"> ENDDO<br> ...</span><br style="font-family: monospace;"><span style="font-family: monospace;"> ELSEIF ( mode == 'average' ) THEN<br> ...</span><br style="font-family: monospace;"><span style="font-family: monospace;"> CASE ( 'u2' )</span><br style="font-family: monospace;"><span style="font-family: monospace;"> DO i = nxl-1, nxr+1</span><br style="font-family: monospace;"><span style="font-family: monospace;"> DO j = nys-1, nyn+1</span><br style="font-family: monospace;"><span style="font-family: monospace;"> DO k = nzb, nzt+1</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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| 60 | 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;"> ENDDO</span><br style="font-family: monospace;"><span style="font-family: monospace;"> ENDDO</span><br style="font-family: monospace;"><span style="font-family: monospace;"> ENDDO</span><br><br> </li><li>For output of 2d cross sections, the gridpoint data of the quantity has to be resorted to array <span style="font-family: monospace;">local_pf</span> in subroutine <a href="chapter_3.5.1.html#user_data_output_2d"><span style="font-family: monospace;">user_data_output_2d</span></a>. Also the vertical grid, on which the quantity is defined, has to be set again:<br><br><span style="font-family: monospace;"> CASE ( 'u2_xy', 'u2_xz', 'u2_yz' )</span><br style="font-family: monospace;"><span style="font-family: monospace;"> IF ( av == 0 ) THEN</span><br style="font-family: monospace;"><span style="font-family: monospace;"> DO i = nxl-1, nxr+1</span><br style="font-family: monospace;"><span style="font-family: monospace;"> DO j = nys-1, nyn+1</span><br style="font-family: monospace;"><span style="font-family: monospace;"> DO k = nzb, nzt+1</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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| 61 | local_pf(i,j,k) = u2(k,j,i)</span><br style="font-family: monospace;"><span style="font-family: monospace;"> ENDDO</span><br style="font-family: monospace;"><span style="font-family: monospace;"> ENDDO</span><br style="font-family: monospace;"><span style="font-family: monospace;"> ENDDO</span><br style="font-family: monospace;"><span style="font-family: monospace;"> ELSE</span><br style="font-family: monospace;"><span style="font-family: monospace;"> DO i = nxl-1, nxr+1</span><br style="font-family: monospace;"><span style="font-family: monospace;"> DO j = nys-1, nyn+1</span><br style="font-family: monospace;"><span style="font-family: monospace;"> DO k = nzb, nzt+1</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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| 62 | local_pf(i,j,k) = u2_av(k,j,i)</span><br style="font-family: monospace;"><span style="font-family: monospace;"> ENDDO</span><br style="font-family: monospace;"><span style="font-family: monospace;"> ENDDO</span><br style="font-family: monospace;"><span style="font-family: monospace;"> ENDDO</span><br style="font-family: monospace;"><span style="font-family: monospace;"> ENDIF</span><br style="font-family: monospace;"><br style="font-family: monospace;"><span style="font-family: monospace;"> grid = 'zu'</span><br> <br>The <span style="font-family: monospace;">ELSE</span> case is only needed in case that output of time-averaged data is requested.<br><br><br></li><li>For output of 3d volume data, the gridpoint data of the quantity has to be resorted to array <span style="font-family: monospace;">local_pf</span> in subroutine <a href="chapter_3.5.1.html#user_data_output_3d"><span style="font-family: monospace;">user_data_output_3d</span></a>. Also the vertical grid, on which the quantity is defined, has to be set again:<br><br><span style="font-family: monospace;"> CASE ( 'u2' )</span><br style="font-family: monospace;"><span style="font-family: monospace;"> IF ( av == 0 ) THEN</span><br style="font-family: monospace;"><span style="font-family: monospace;"> DO i = nxl-1, nxr+1</span><br style="font-family: monospace;"><span style="font-family: monospace;"> DO j = nys-1, nyn+1</span><br style="font-family: monospace;"><span style="font-family: monospace;"> DO k = nzb, nz_do</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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| 63 | local_pf(i,j,k) = u2(k,j,i)</span><br style="font-family: monospace;"><span style="font-family: monospace;"> ENDDO</span><br style="font-family: monospace;"><span style="font-family: monospace;"> ENDDO</span><br style="font-family: monospace;"><span style="font-family: monospace;"> ENDDO</span><br style="font-family: monospace;"><span style="font-family: monospace;"> ELSE</span><br style="font-family: monospace;"><span style="font-family: monospace;"> DO i = nxl-1, nxr+1</span><br style="font-family: monospace;"><span style="font-family: monospace;"> DO j = nys-1, nyn+1</span><br style="font-family: monospace;"><span style="font-family: monospace;"> DO k = nzb, nz_do</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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| 64 | local_pf(i,j,k) = u2_av(k,j,i)</span><br style="font-family: monospace;"><span style="font-family: monospace;"> ENDDO</span><br style="font-family: monospace;"><span style="font-family: monospace;"> ENDDO</span><br style="font-family: monospace;"><span style="font-family: monospace;"> ENDDO</span><br style="font-family: monospace;"><span style="font-family: monospace;"> ENDIF</span><br style="font-family: monospace;"><br style="font-family: monospace;"><span style="font-family: monospace;"> grid = 'zu'</span><br><br>The <span style="font-family: monospace;">ELSE</span> case is only needed in case that output of time-averaged data is requested.<br><br><br></li><li>In case of job chains, the sum array has to be written to the (binary) restart file (local filename <a href="chapter_3.4.html#BINOUT">BINOUT</a>) 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;"> IF ( ALLOCATED( u2_av ) ) THEN</span><br style="font-family: monospace;"><span style="font-family: monospace;"> |
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| 65 | WRITE ( 14 ) |
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| 66 | 'u2_av |
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| 67 | '; WRITE ( 14 ) u2_av</span><br style="font-family: monospace;"><span style="font-family: monospace;"> ENDIF</span><br><br>Otherwise, the calculated time-average may be wrong. </li></ol><hr> |
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| 68 | <p style="line-height: 100%;"><br> |
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| 69 | <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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| 70 | <p style="line-height: 100%;"><i>Last change: </i> 24/03/06 (SR)</p> |
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