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time step reg.

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Old   December 23, 2008, 01:36
Default time step reg.
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Hi What is the significance of timestep in steady state solution,and what it mean in steady state solution.

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Old   December 23, 2008, 17:34
Default Re: time step reg.
Glenn Horrocks
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In a steady state simulation it is a psuedo-timestep. It is used to advance the simulation towards convergence and it is based on a physical timestep, but it has several simplifications so is not a true timestep. These simplifications include not including some transient cross-terms and the ability to advance different equations at different rates. This means an intermediate solution is not equivalent to a transient solution, only the final converged solution is relevant.

There was a very good summary of this posted a while back, I think posted by Cyclone (not sure) but I can't seem to find it with the search. It described in detail the simplifications made in a steady state simulation.

Glenn Horrocks
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