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