Changes between Version 3 and Version 4 of doc/app/par
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- Sep 16, 2010 1:22:21 PM (15 years ago)
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doc/app/par
v3 v4 21 21 The '''initialization''', '''run''' and '''package''' parameters differ as follows: 22 22 23 * The '''initialization parameters''' are steering the basic settings of the model run. They define e.g. the number of the grid points, the numerical schemes to be used, initial and boundary conditions to be applied, how the three-dimensional fields are initialized at the beginning of a model run (constant value profiles or 1D-model-pre-run, the initial temperature profile etc.). These parameters apply to the total model run and thus can not be changed with restart runs! If one tries to change these values within the NAMELIST input file of a restart run, then these changes are ignored (sole exception is the parameter [../inipar#initializing_actions initializing_action ], which must be given the value '' 'read_restart_data' '' for restart runs).23 * The '''initialization parameters''' are steering the basic settings of the model run. They define e.g. the number of the grid points, the numerical schemes to be used, initial and boundary conditions to be applied, how the three-dimensional fields are initialized at the beginning of a model run (constant value profiles or 1D-model-pre-run, the initial temperature profile etc.). These parameters apply to the total model run and thus can not be changed with restart runs! If one tries to change these values within the NAMELIST input file of a restart run, then these changes are ignored (sole exception is the parameter [../inipar#initializing_actions initializing_actions], which must be given the value '' 'read_restart_data' '' for restart runs). 24 24 25 25 * The '''run parameters''' are generally steering actions to be carried out during a model run. One can select for example, at which times plot output should happen and which variables are to be written. Additionally one can (and must) specify the time to be simulated. Run parameters only apply to the actual run (job) and with each restart run other values may be declared (if runs are restarted automatically, parameters will usually keep their values, provided that the NAMELIST input file was not changed by the user in the meantime). … … 27 27 * Package parameters behave like '''run parameters'''. Package parameters determine the behavior of the additional (not user-defined) software packages. 28 28 29 The user-defined parameters are assigned by the user within the NAMELIST group name &userpar (see chapter 3.5.2). They steer actions programmed by the user. By default, this group has only one parameter (region). If the user don't want to assign any values to the user-defined parameters, the group userpar may be omitted. The group name &userpar can be changed by the user in the user-defined code. In addition to this, further NAMELIST groups may also be declared (all within routine user_parin in file user_interface.f90). Chapter 4.4.1 shows a simple but complete example of the input file PARIN. This example file can be used together with the configuration file (described in chapter 3.2) for the execution of a model test run. 30 29 The user-defined parameters are assigned by the user within the NAMELIST group name {{{&userpar}}} ([../userint/userpar see "Definition of user-defined parameters"]). They steer actions programmed by the user. By default, this group has only one parameter ([../userpar#region region]). If the user don't want to assign any values to the user-defined parameters, the group {{{userpar}}} may be omitted. The group name {{{&userpar}}} can be changed by the user in the user-defined code. In addition to this, further NAMELIST groups may also be declared (all within routine [source:palm/trunk/SOURCE/user_parin.f90 user_parin]). [../examples/cbl Section "A minimum parameter set for the CBL"] shows a simple but complete example of the input file PARIN. This example file can be used together with the configuration file (described in [../configexample Section "Example of a minimum configuration file"]) for the execution of a model test run.\\ 31 30 PALM assigns default values to nearly all parameters. They become effective if no other assignments are given in the parameter file. These default values as well as the parameter name, type and its explanation are described in the lists of the following subsections.