difference between false and true transient
In case of unsteady calculations one often encounters two terms namely : False transient, True transient. As I understand it, a false transient solution does not give the true transient behaviour but gives the correct final steady solution. Are there any other differences between a false transient and true transient solution?
Thanks 
Re: difference between false and true transient
There are only two types of equations:(1) steadystate equations, and (2) unsteadystate equations. The unsteadystate equations describe the transient behavior of the problem. Sometimes, instead of using the steadystate equations to obtain the steadystate solutions, people have tried to use the unsteadystate equations to obtain the steadystate solution. But, you never know whether this approach will lead you to the steadystate solution or not. And you also have to run the code for a long time in search of the steadystate solution. In the hope to reduce the computing time, some people try to set the time step to be a function of the grid point ( or cell ) in such a way that the time step for that cell can be increased thus the computing time reduced ( if the steadystate solution can be found in this way).

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