sunfluidh:simulation_management_setup_namelist
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Les deux révisions précédentesRévision précédenteProchaine révision | Révision précédenteProchaine révisionLes deux révisions suivantes | ||
sunfluidh:simulation_management_setup_namelist [2016/11/12 12:34] – yann | sunfluidh:simulation_management_setup_namelist [2019/12/13 15:50] – yann | ||
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This data setup allows the user to set the time parameters of the code in order to : | This data setup allows the user to set the time parameters of the code in order to : | ||
* perform the numerical simulation (time step, stopping criteria...) | * perform the numerical simulation (time step, stopping criteria...) | ||
- | * record the results associated to time series of probes, instantaneous quantity fields, statistical quantities. | + | * record the results associated to time series of probes, instantaneous |
* record the backup/ | * record the backup/ | ||
+ | ===== Full data set of the namelist ===== | ||
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+ | & | ||
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----- | ----- | ||
- | ==== Restart_Parameter | + | ===== Definition of the data set ===== |
+ | ----- | ||
+ | |||
+ | ---- | ||
+ | ==== Restart the simulation ==== | ||
+ | ---- | ||
+ | **Restart_Parameter** | ||
* Type : Integer Value | * Type : Integer Value | ||
* This data indicates how is initialized the simulation : | * This data indicates how is initialized the simulation : | ||
Ligne 12: | Ligne 40: | ||
* 3 : The simulation is resumed from the last backup file built during the last time step of the previous simulation. Useful to continue a incompleted simulation. The number 3 must be present in the file num_sav_xxxxx.d (proof that the previous simulation is correctly completed), otherwise the numbers 0, 1 or 2 (related to the previous cases) will be present. | * 3 : The simulation is resumed from the last backup file built during the last time step of the previous simulation. Useful to continue a incompleted simulation. The number 3 must be present in the file num_sav_xxxxx.d (proof that the previous simulation is correctly completed), otherwise the numbers 0, 1 or 2 (related to the previous cases) will be present. | ||
- | ==== Steady_Flow_Stopping_Criterion_Enabled | + | ---- |
+ | ==== Stopping criteria | ||
+ | ---- | ||
- | * Type : Boolean value | + | **Steady_Flow_Stopping_Criterion_Enabled** |
- | * Activation of the stopping criterion for steady flow (based on the L2-norm of the time variation of quantities). | + | |
- | ==== Steady_Flow_Stopping_Criterion | + | * Type : Boolean value. |
+ | * Activation of the stopping criterion for steady flow (based on the L2-norm of the time variation of physical quantities). | ||
+ | |||
+ | **Steady_Flow_Stopping_Criterion** | ||
* Type : Real value | * Type : Real value | ||
- | * When the L2-norm of the time variation of quantities is lower than this value, the simulation is stopped and the solution corresponds to a steady flow. | + | * When the L2-norm of the time variation of physical |
- | ==== Number_Temporal_Iterations | + | **Number_Temporal_Iterations** |
* Type : Integer value | * Type : Integer value | ||
* This value is the maximum of time iterations performed by the code before stopping. | * This value is the maximum of time iterations performed by the code before stopping. | ||
- | ==== Final_Time | + | **Final_Time** |
* Type : Real value | * Type : Real value | ||
* This value is the physical time limit reached by the simulation before stopping. | * This value is the physical time limit reached by the simulation before stopping. | ||
+ | |||
+ | < | ||
+ | The simulation stops as soon as one of these conditions is achieved. | ||
+ | </ | ||
+ | |||
+ | ---- | ||
+ | ==== Numerical time step ==== | ||
+ | ---- | ||
+ | |||
+ | **TimeStep_Type** | ||
+ | * Type : Integer value | ||
+ | * Selection of way to define the numerical time step : | ||
+ | * 0 : The time step is constant and defined by the user by means of the variable " | ||
+ | * -1 : The time step evolves lineraly between the values given by " | ||
+ | * 1 : The time step is calculated for each time iteration by means of the CFL parameter. The CFL parameter can be constant, it is thus defined by the variable " | ||
+ | **Timestep_min** | ||
+ | * Type : Real value | ||
+ | * Minimum value of the time step. This variable can be omitted when the time step is constant. | ||
+ | **Timestep_max** | ||
+ | * Type : Real value | ||
+ | * Maximum value of the time step. This variable set the value of the time step when it is constant. | ||
+ | **CFL_min** | ||
+ | * Type : Real value. This variable can be omitted when the time step is constant. | ||
+ | * Minimum value of the CFL parameter (can be omitted, in this case **CFL_Max** will define the CFL value). | ||
+ | **CFL_max** | ||
+ | * Type : Real value | ||
+ | * Maximum value of the CFL parameter. This variable set the value of the CFL parameter when it is constant (in this case, **CFL_Min** is useless). | ||
+ | **Iterations_For_Timestep_Linear_Progress** | ||
+ | * Type : Integer value | ||
+ | * Number of time iterations over which the CFL parameter or the time step can evolve linearly. When the time step or the CFL parameter are constant, this variable must not set to a value greater than 1. It could actually be omitted (this default value is 1). | ||
+ | |||
+ | < | ||
+ | For a dynamic computation of the time step from a CFL condition, you can only set the variable **CFL_Max** if you want a constant CFL value and **CFL_Min** can be omitted.\\ | ||
+ | In any way, the maximum value the time step can reached is limited by the value of **Timestep_max** (useful when the initial condition is defined from a zero velocity field for which the time step cannot be computed from the CFL condition). | ||
+ | </ | ||
+ | |||
+ | |||
+ | |||
+ | ---- | ||
+ | ==== Recording rates for different kind of files ==== | ||
+ | ---- | ||
+ | |||
+ | ==== - For backup/ | ||
+ | |||
+ | **Simulation_Backup_Rate** | ||
+ | * Type : Integer value | ||
+ | * This variable defines the recording rate, __in time iteration unit__ , of the backup files (for instance, when " | ||
+ | |||
+ | ==== - For snapshot files : ==== | ||
+ | |||
+ | **InstantaneousFields_RecordingStartTime** | ||
+ | * Type : Real value | ||
+ | * This variable sets the time threshold from which the record of instantaneous fields begins. It must be used along with the next variable " | ||
+ | |||
+ | **InstantaneousFields_TimeRecordingRate** | ||
+ | * Type : Real value | ||
+ | * This variable defines the recording rate, __in time unit__ , of instantaneous fields. For instance, when " | ||
+ | |||
+ | **InstantaneousFields_StartTimeIterationRecording** | ||
+ | * Type : Integer value | ||
+ | * This variable sets the time-iteration threshold from which the record of instantaneous fields begins. It must be used along with the next variable " | ||
+ | |||
+ | **InstantaneousFields_TimeIterationRecordingRate** | ||
+ | * Type : Integer value | ||
+ | * This variable defines the recording rate, __in time-iteration units__ , of instantaneous fields. For instance, when " | ||
+ | |||
+ | **InstantaneousFields_RecordingReset** | ||
+ | * Type : Boolean value. The default value is .false. | ||
+ | * When this variable is set to " | ||
+ | |||
+ | |||
+ | < | ||
+ | Keep in mind : | ||
+ | * Instantaneous field files are named res_xxxxxxx_yyyyy.d. T | ||
+ | * The number ' | ||
+ | | ||
+ | * The instantaneous fields of the physical quantities written in each file are defined with the namelist " | ||
+ | </ | ||
+ | |||
+ | <WRAP important> | ||
+ | This set of variables must be used in respect of one rule : the user wants to define the recording rate of files either in time unit or in number of time steps (time-ieration unit). In any case, the correct couple of variables must be used. | ||
+ | * " | ||
+ | * " | ||
+ | |||
+ | </ | ||
+ | |||
+ | ==== - For statistics files : ==== | ||
+ | |||
+ | **Start_Time_For_Statistics** | ||
+ | * Type : Real value | ||
+ | * Time from which the statistical fields are calculated. | ||
+ | **Time_Range_Statistic_Calculation** | ||
+ | * Type : Real value | ||
+ | * Time range over which statistical fields are calculated. When this time range has been covered, statistical fields are recorded in a file named rst_xxxxxxx_yyyyy.d (' | ||
+ | |||
+ | ==== - For probe time-series files : ==== | ||
+ | |||
+ | **Probe_TimeIterationRecordingRate** | ||
+ | * Type : Integer value | ||
+ | * This variable defines the recording rate, __in time iteration unit__ (number of time steps), of time series from probes distributed over the domain (see the namelist " | ||
+ | |||
+ | **Probe_StartTimeIterationRecording** | ||
+ | * Type : Integer value | ||
+ | * This variable defines the threshold from which the probe time-series start (in time iteration unit) | ||
+ | |||
+ | **Probe_RecordingReset** | ||
+ | * Type : Boolean value. The default value is .false. | ||
+ | * When this variable is set to " |
sunfluidh/simulation_management_setup_namelist.txt · Dernière modification : 2022/01/10 10:34 de yann