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doc:user:integration:general:time_step

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doc:user:integration:general:time_step [2015/01/26 10:24] – jorisdoc:user:integration:general:time_step [2020/12/28 10:55] (current) – [Use of Metafac] tanaka
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 __Automatic creation of the movie:__ __Automatic creation of the movie:__
  
-    * Run a programm to create movies from the files (for example [[http://www.helesic.cz/en/avimaker.php|AVImaker]]).+    * Run a program to create movies from the files (for example [[http://www.helesic.cz/en/avimaker.php|AVImaker]]).
  
  
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     tsm = metafor.getTimeStepManager()     tsm = metafor.getTimeStepManager()
     tsm.setTimeStepComputationMethod(meth)     tsm.setTimeStepComputationMethod(meth)
 +    tsm.setTolOnFac(tolOnFac)
     tsm.setIntegrationErrorTolerance(prec)     tsm.setIntegrationErrorTolerance(prec)
     tsm.setExplicitTimeStepSecurity(secu)     tsm.setExplicitTimeStepSecurity(secu)
     tsm.setNbOfStepsForCriticalTimeStepUpdate(nrit)     tsm.setNbOfStepsForCriticalTimeStepUpdate(nrit)
     tsm.setMaxNbOfItInAdaptOfTimeStep(nbIter) (option: used in implicit or quasi-static)     tsm.setMaxNbOfItInAdaptOfTimeStep(nbIter) (option: used in implicit or quasi-static)
 +    tsm.setMinimumTimeStep(minTimeStep) 
 +    
 ^ Parameter ^ Default value ^ Description ^ ^ Parameter ^ Default value ^ Description ^
 | ''meth'' |   | = ''TSM_NBOFITERATIONSMETHOD'' : in implicit, the current time step depends on the number of iterations in the previous time step, when in explicit it only depends on the critical one and the parameter ''secu''| | ''meth'' |   | = ''TSM_NBOFITERATIONSMETHOD'' : in implicit, the current time step depends on the number of iterations in the previous time step, when in explicit it only depends on the critical one and the parameter ''secu''|
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 | ''nrit'' |  1  | number of time steps before updating the critical time step | | ''nrit'' |  1  | number of time steps before updating the critical time step |
 | ''nbIter'' |  5  | Minimal number of iterations in the algorithm in charge of reducing the time step. If the required number is greater than ''nbIter'', the subsequent time step will be lower than the current one. Otherwise, it will be equal or greater. | | ''nbIter'' |  5  | Minimal number of iterations in the algorithm in charge of reducing the time step. If the required number is greater than ''nbIter'', the subsequent time step will be lower than the current one. Otherwise, it will be equal or greater. |
 +| ''minTimeStep'' |  1.0E-10  | minimum time step below which metafor stops running. | 
 +| ''tolOnFac'' | 0.1 | tolerance on time step for the discrete times corresponding to archiving (FAC). |
 ==== Quasi-static and dynamic implicit schemes ===== ==== Quasi-static and dynamic implicit schemes =====
  
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   * Constant safety, coefficient, no guaranty on the accuracy.   * Constant safety, coefficient, no guaranty on the accuracy.
   * Safety coefficient based on an integration error. It computes an integration error based on the difference of the norm of the acceleration. A maximal value is set by the user. Practically, the safety coefficient will only be lower than this user parameter for highly dynamic situations, such as impact.   * Safety coefficient based on an integration error. It computes an integration error based on the difference of the norm of the acceleration. A maximal value is set by the user. Practically, the safety coefficient will only be lower than this user parameter for highly dynamic situations, such as impact.
 +
 +==== New Interface For Time Step Computation Method ====
 +
 +<note important>
 +The commands from the new interface are discussed in the following page
 +Cf. [[commit:2015:11_18]] 
 +</note>
 +
 +
doc/user/integration/general/time_step.1422264299.txt.gz · Last modified: (external edit)
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