[suman91]

Hi Santiago,

Am posting the Questions over here as you asked me to.

Q1. What is the name of the variable in the code that keeps a track
of the total time. Where is it defined and used and where is it
incremented- that is : time = time + delta_time ?


Q2. If it is required to stop the simulation at a particular exact
time, it was suggested before to use the variable "UNST_TIME" in the
config file under unsteady simulation to do it. But the exit
conditions of the program are based on Ext_Iter or the residual
convergence. Then where does it have this condition of exiting based
on UNST_TIME mentioned in the code.


Q3. What if i want to do this for a steady problem. How to get solution for an
exact time?

Thanks again for the reply.

[Santiago Padron]

Q1. In the code we keep track of the total iteration variable ExtIter and increment it for each iteration. This is done in SU2_CFD.cpp file. And we keep track of the provided delta_time in in the config class and can obtain its value with the method GetDelta_UnstTime(). So we keep track of the total time by multiplying the ExtIter*delta_time. You can see this done in the function MeanFlowIteration in iteration_structure.cpp.

Q2. If you look at the end of the MeanFlowIteration function in iteration_structure.cpp you will see the UNST_TIME option being used. You can also always stop the simulation at an exact time by using the Ext_Iter stopping criteria (t = Ext_Iter*dt).

Q3. I’m not sure I fully understand this question, but I steady problem does not depend on time, so it doesn’t make sense to stop it before it has converged to a desired level of accuracy. To stop the steady problem you can also use Ext_Iter in addition to the residual convergence criteria.

[fpalacios]

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