AdaptTimeStep.cpp File Reference

This function computes the time step for the next iteration. More...

#include "Carmen.h"

Include dependency graph for AdaptTimeStep.cpp:

Functions
void	AdaptTimeStep ()
	Adapts time step when required. More...

Detailed Description

This function computes the time step for the next iteration.

Function Documentation

void AdaptTimeStep

(

)

Adapts time step when required.

Returns

void

{
    int     RemainingIterations;
    real    RemainingTime;


    // Security : do nothing if ConstantTimeStep is true

    if (ConstantTimeStep)
        return;

    // Compute remaining time

    RemainingTime = PhysicalTime-ElapsedTime;


    // In this case, use time adaptivity based on CFL
    if(Resistivity)
        TimeStep = CFL*min(SpaceStep/Eigenvalue,SpaceStep*SpaceStep/(4*eta));
    else
        TimeStep = CFL*SpaceStep/Eigenvalue;

    // Recompute IterationNb

    if (RemainingTime <= 0.)
    {
        IterationNb = IterationNo;
    }
    else if (RemainingTime < TimeStep)
    {
        TimeStep = RemainingTime;
        IterationNb = IterationNo + 1;
    }
    else
    {
        RemainingIterations =  (int)(RemainingTime/TimeStep);
        IterationNb = IterationNo + RemainingIterations;
    }

    return;

}

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