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-   -   changing time step during a run (http://www.cfd-online.com/Forums/cfx/18966-changing-time-step-during-run.html)

N Menon May 6, 2002 06:32

changing time step during a run
 
Hi,

I trying to simulate a supersonic jet exiting from a circular nozzle, into ambient conditions. the domain length it over 100 nozzle radii long, and so the flow contians regions where the velocity scales r small. it is possible to change the time step during a run such that after the faster regions of flow converge using a small time step, the slower regions can be solved using a higher timestep other wise the convergence rates r just too slow

The simulation is being done on CFX 5.5

cheers nandu

Astrid May 6, 2002 06:59

Re: changing time step during a run
 
Please read the following thread:

http://www.cfd-online.com/Forum/cfx.cgi?read=2485

Astrid

N Menon May 6, 2002 07:17

Re: changing time step during a run
 
HI,

thanks for that. i have however managed to get a converged solution by stopping the simulation after ~50 timesteps with a small timestep, and then using the advection time from the intermediate result to run the simulation to a final converged solution.

thanks nandu


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