| 1 | <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> |
|---|
| 2 | <html> |
|---|
| 3 | <head> |
|---|
| 4 | |
|---|
| 5 | |
|---|
| 6 | |
|---|
| 7 | <meta http-equiv="CONTENT-TYPE" content="text/html; charset=windows-1252"> |
|---|
| 8 | |
|---|
| 9 | |
|---|
| 10 | |
|---|
| 11 | |
|---|
| 12 | <title>PALM chapter 4.0</title> |
|---|
| 13 | <meta name="GENERATOR" content="StarOffice 7 (Win32)"> |
|---|
| 14 | |
|---|
| 15 | |
|---|
| 16 | |
|---|
| 17 | <meta name="AUTHOR" content="Siegfried Raasch"> |
|---|
| 18 | |
|---|
| 19 | |
|---|
| 20 | |
|---|
| 21 | <meta name="CREATED" content="20040809;14214479"> |
|---|
| 22 | |
|---|
| 23 | |
|---|
| 24 | |
|---|
| 25 | <meta name="CHANGED" content="20041112;15151993"> |
|---|
| 26 | |
|---|
| 27 | |
|---|
| 28 | |
|---|
| 29 | <meta name="KEYWORDS" content="parallel LES model"> |
|---|
| 30 | |
|---|
| 31 | |
|---|
| 32 | |
|---|
| 33 | <style> |
|---|
| 34 | <!-- |
|---|
| 35 | @page { size: 21cm 29.7cm } |
|---|
| 36 | --> |
|---|
| 37 | </style> |
|---|
| 38 | </head> |
|---|
| 39 | |
|---|
| 40 | |
|---|
| 41 | <body style="direction: ltr;" lang="en-US"> |
|---|
| 42 | |
|---|
| 43 | <h2 style="line-height: 100%;"><font size="4">4.0 |
|---|
| 44 | Steering parameters</font></h2> |
|---|
| 45 | |
|---|
| 46 | |
|---|
| 47 | <p style="line-height: 100%;">Before carrying out a model |
|---|
| 48 | run, the user |
|---|
| 49 | has to /determine/ a data set - the model parameters - e.g. how |
|---|
| 50 | many grid points are to be used, how large the horizontal and |
|---|
| 51 | vertical grid spacing should be, which kind of boundary conditions are |
|---|
| 52 | to be used for the individual variables, which numerical schemes |
|---|
| 53 | implemented in the model are to be used, how long the simulated time |
|---|
| 54 | should be, at which times and points plot output are supposed to be |
|---|
| 55 | made, etc. <br> |
|---|
| 56 | |
|---|
| 57 | |
|---|
| 58 | </p> |
|---|
| 59 | |
|---|
| 60 | <p style="line-height: 100%;">These data are |
|---|
| 61 | assigned with the help of |
|---|
| 62 | so-called “NAMELIST-driven input” (FORTRAN - |
|---|
| 63 | NAMELIST – |
|---|
| 64 | input). The chosen values of the model parameters are |
|---|
| 65 | written |
|---|
| 66 | into an ASCII file with fixed format, which is expected by the model as |
|---|
| 67 | an input |
|---|
| 68 | file under the local name <a href="chapter_3.4.html#PARIN">PARIN</a>. |
|---|
| 69 | On this file the parameters are represented by their variable names |
|---|
| 70 | they have in the model. These parameters can be assigned one or more |
|---|
| 71 | values, depending on the type and size the variable has. The following |
|---|
| 72 | example shows the format of the file |
|---|
| 73 | PARIN: <br> |
|---|
| 74 | |
|---|
| 75 | |
|---|
| 76 | </p> |
|---|
| 77 | |
|---|
| 78 | |
|---|
| 79 | <ul> |
|---|
| 80 | |
|---|
| 81 | |
|---|
| 82 | |
|---|
| 83 | <p style="line-height: 100%; font-family: monospace;">&inipar |
|---|
| 84 | nx |
|---|
| 85 | = 79, ny = 79, nz = 40, <br> |
|---|
| 86 | |
|---|
| 87 | |
|---|
| 88 | |
|---|
| 89 | dx = 50.0, dy = 50.0, dz = |
|---|
| 90 | 50.0, <br> |
|---|
| 91 | |
|---|
| 92 | |
|---|
| 93 | |
|---|
| 94 | initializing_actions = |
|---|
| 95 | "set_1d-model_profiles", <br> |
|---|
| 96 | |
|---|
| 97 | |
|---|
| 98 | |
|---|
| 99 | prandtl_layer = .TRUE.,/ </p> |
|---|
| 100 | |
|---|
| 101 | |
|---|
| 102 | |
|---|
| 103 | <p style="line-height: 100%; font-family: monospace;">&d3par |
|---|
| 104 | end_time = 9000.0, section_xy = 1, 10, 20,/ </p> |
|---|
| 105 | |
|---|
| 106 | |
|---|
| 107 | |
|---|
| 108 | <p style="line-height: 100%; font-family: monospace;">&packagename |
|---|
| 109 | var1 = .TRUE. / </p> |
|---|
| 110 | |
|---|
| 111 | |
|---|
| 112 | |
|---|
| 113 | <p style="line-height: 100%;"><span style="font-family: monospace;">&userpar |
|---|
| 114 | abcd = 1234,0,/ </span><br> |
|---|
| 115 | |
|---|
| 116 | |
|---|
| 117 | <br> |
|---|
| 118 | |
|---|
| 119 | |
|---|
| 120 | </p> |
|---|
| 121 | |
|---|
| 122 | |
|---|
| 123 | </ul> |
|---|
| 124 | |
|---|
| 125 | <p style="line-height: 100%;">The parameters |
|---|
| 126 | are separated into four |
|---|
| 127 | different groups which all start with the so-called NAMELIST group |
|---|
| 128 | names. |
|---|
| 129 | These are <span style="font-family: monospace;">&inipar</span>, |
|---|
| 130 | <span style="font-family: monospace;">&d3par</span> |
|---|
| 131 | and <span style="font-family: monospace;">&packagename</span> |
|---|
| 132 | as well as <span style="font-family: monospace;">&userpar</span>. |
|---|
| 133 | In each case a |
|---|
| 134 | group is terminated with one backslash ("/"). Between the beginning of |
|---|
| 135 | the line and the group name at least one blank has to be typed. Between |
|---|
| 136 | the |
|---|
| 137 | group names and the "/", the |
|---|
| 138 | values are assigned to the variables. The example shows that in |
|---|
| 139 | principle all FORTRAN data types are allowed. For more details |
|---|
| 140 | concerning the NAMELIST syntax, refer to |
|---|
| 141 | appropriate FORTRAN manuals. <br> |
|---|
| 142 | |
|---|
| 143 | |
|---|
| 144 | </p> |
|---|
| 145 | |
|---|
| 146 | <p style="line-height: 100%;">Parameters |
|---|
| 147 | belonging to the group <span style="font-family: monospace;">inipar</span> |
|---|
| 148 | are first read by PALM. |
|---|
| 149 | These are the initialization parameters. Second, the so-called run |
|---|
| 150 | parameters belonging to the group <span style="font-family: monospace;">d3par</span> |
|---|
| 151 | are read in, then the parameters for steering the optional software |
|---|
| 152 | packages (group <span style="font-family: monospace;">packagename,</span> |
|---|
| 153 | the string <span style="font-family: monospace;">"packagename"</span> |
|---|
| 154 | must be replaced by the NAMELIST |
|---|
| 155 | group name of the respective package) as well as user-defined |
|---|
| 156 | parameters |
|---|
| 157 | (group <span style="font-family: monospace;">userpar</span>). |
|---|
| 158 | The four |
|---|
| 159 | groups must be given in this order, the last groups, <span style="font-family: monospace;">packagename</span> and |
|---|
| 160 | <span style="font-family: monospace;">userpar</span>, |
|---|
| 161 | may |
|---|
| 162 | be omitted. If several software packages are selected |
|---|
| 163 | (see chapter <a href="chapter_3.7.html">3.7</a>), |
|---|
| 164 | further NAMELIST groups may be inserted before the group <span style="font-family: monospace;">userpar</span>. |
|---|
| 165 | </p> |
|---|
| 166 | |
|---|
| 167 | <p style="line-height: 100%;"><b>The |
|---|
| 168 | initialization, run</b> and |
|---|
| 169 | <b>package parameters</b> differ as follows: </p> |
|---|
| 170 | |
|---|
| 171 | |
|---|
| 172 | <ul> |
|---|
| 173 | |
|---|
| 174 | <li> |
|---|
| 175 | |
|---|
| 176 | <p style="margin-bottom: 0cm; line-height: 100%;">The <b>initialization |
|---|
| 177 | parameters </b>are steering the basic settings of the model run. |
|---|
| 178 | They |
|---|
| 179 | define e.g. the number of the grid points, the numerical schemes to be |
|---|
| 180 | used, initial and boundary conditions to be applied, how the |
|---|
| 181 | three-dimensional fields are initialized at the beginning of a model |
|---|
| 182 | run (constant value profiles or 1D-model-pre-run, the initial |
|---|
| 183 | temperature profile etc.). These parameters apply to the total model |
|---|
| 184 | run and thus can not be changed with restart runs! If one tries to |
|---|
| 185 | change these values within the NAMELIST input file of a restart run, |
|---|
| 186 | then these changes are ignored (sole exception is the parameter <a style="font-family: monospace;" href="chapter_4.1.html#initializing_actions">initializing_actions</a><font style="font-size: 10pt;" size="2">, </font>which |
|---|
| 187 | must be given the |
|---|
| 188 | value<span style="font-family: thorndale,serif,mon;"> </span><span style="font-family: monospace; font-style: italic;">read_restart_data</span><span style="font-family: thorndale,serif,mon;"> for </span>restart |
|---|
| 189 | runs). <br> |
|---|
| 190 | |
|---|
| 191 | |
|---|
| 192 | </p> |
|---|
| 193 | |
|---|
| 194 | </li> |
|---|
| 195 | |
|---|
| 196 | <li> |
|---|
| 197 | |
|---|
| 198 | <p style="margin-bottom: 0cm; line-height: 100%;">The <b>run |
|---|
| 199 | parameters</b> are generally steering actions to be carried out |
|---|
| 200 | during |
|---|
| 201 | a model run. One can select for example, at which times plot output |
|---|
| 202 | should happen and which variables are to be written. Additionally one |
|---|
| 203 | can (and must) specify the time to be simulated. Run parameters only |
|---|
| 204 | apply to the actual run (job) and with each restart run other values |
|---|
| 205 | may be declared (if runs are restarted automatically, parameters will |
|---|
| 206 | usually keep their values, provided that the NAMELIST input file was |
|---|
| 207 | not changed by the user in the meantime). <br> |
|---|
| 208 | |
|---|
| 209 | |
|---|
| 210 | </p> |
|---|
| 211 | |
|---|
| 212 | </li> |
|---|
| 213 | |
|---|
| 214 | <li> |
|---|
| 215 | |
|---|
| 216 | <p style="line-height: 100%;"><b>Package parameters</b> |
|---|
| 217 | behave like <b>run parameters</b>. Package parameters |
|---|
| 218 | determine the behavior of |
|---|
| 219 | the additional (not user-defined) software packages . </p> |
|---|
| 220 | |
|---|
| 221 | </li> |
|---|
| 222 | |
|---|
| 223 | |
|---|
| 224 | </ul> |
|---|
| 225 | |
|---|
| 226 | <p style="line-height: 100%;">The user-defined |
|---|
| 227 | parameters are assigned |
|---|
| 228 | by the user within the NAMELIST group name <tt>&userpar</tt> |
|---|
| 229 | (see <a href="chapter_3.5.2.html">chapter |
|---|
| 230 | 3.5.2</a>). They steer actions programmed by the user. By |
|---|
| 231 | default, |
|---|
| 232 | this group has only one parameter (<a href="chapter_4.3.html#region">region</a>). |
|---|
| 233 | If the |
|---|
| 234 | user don't want to assign any values to the user-defined |
|---|
| 235 | parameters, the group<span style="font-family: monospace;"> |
|---|
| 236 | userpar |
|---|
| 237 | </span>may be omitted. The group name <span style="font-family: monospace;">&userpar</span> |
|---|
| 238 | can be changed by the user in the user-defined code. In |
|---|
| 239 | addition to this, further NAMELIST groups may also be declared (all |
|---|
| 240 | within routine <span style="font-family: monospace;">user_parin</span> |
|---|
| 241 | in file <span style="font-family: monospace;">user_interface.f90</span>). |
|---|
| 242 | <a href="chapter_4.4.1.html">Chapter |
|---|
| 243 | 4.4.1</a> shows a simple but complete example of the input file |
|---|
| 244 | PARIN. |
|---|
| 245 | This example file can be used together with the configuration file |
|---|
| 246 | (described in <a href="chapter_3.2.html">chapter |
|---|
| 247 | 3.2</a>) for the execution of a model test run. </p> |
|---|
| 248 | |
|---|
| 249 | |
|---|
| 250 | <p style="line-height: 100%;">PALM assigns default |
|---|
| 251 | values to nearly all parameters. They become effective |
|---|
| 252 | if no other assignments are given in the parameter file. These |
|---|
| 253 | default values as well as the parameter name, type and its |
|---|
| 254 | explanation are described in the lists of the following subsections. <br> |
|---|
| 255 | |
|---|
| 256 | |
|---|
| 257 | </p> |
|---|
| 258 | |
|---|
| 259 | |
|---|
| 260 | <hr> |
|---|
| 261 | <p style="line-height: 100%;"><br> |
|---|
| 262 | |
|---|
| 263 | |
|---|
| 264 | <font color="#000080"><font color="#000080"><a href="chapter_3.8.html"><font color="#000080"><img style="border: 2px solid ; width: 32px; height: 32px;" alt="" src="left.gif" name="Grafik1"></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_4.1.html"><font color="#000080"><img src="right.gif" name="Grafik3" align="bottom" border="2" height="32" width="32"></font></a></font></font><br> |
|---|
| 265 | |
|---|
| 266 | |
|---|
| 267 | <br> |
|---|
| 268 | |
|---|
| 269 | |
|---|
| 270 | <span style="font-style: italic;">Last change:</span> |
|---|
| 271 | $Id: chapter_4.0.html 108 2007-08-24 15:10:38Z raasch $<br> |
|---|
| 272 | |
|---|
| 273 | |
|---|
| 274 | </p> |
|---|
| 275 | |
|---|
| 276 | </body> |
|---|
| 277 | </html> |
|---|
