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need for an unsteady implicit solver suitable for large timestep

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Old   May 24, 2010, 15:11
Default need for an unsteady implicit solver suitable for large timestep
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Leonardo Nettis
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Dear all,

at the moment I'm facing the simulation of a flow around a sphere. The Reynolds is very low (27), therefore pressure and velocity are steady.
However the next step consists in performing a simulation in which the temperature at the inlet is linearly changing in time. Therefore I have to use a transient solver.
Due to the fact that the flow is steady (no risk of changing the physics of the flow) and due to the huge amount of time I have to simulate, I think the best solution is a very large time step. That's not possible with icofoam since it will take approximately 400 days to obtain the solution!!!! But I hope my PhD will end up by that time ))
Somebody knows an alternative solver able to do that?!?!?
Thanks in advance,

Dino
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Old   May 25, 2010, 13:40
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Leonardo Nettis
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I already tried pimpleFoam, but it seems to be not appropriate since starting from a converged solution, in terms of pressure and velocity, and using a Co=2 the pressure residuals are fixed to 0.8!!!!
Any suggestion is well accepted!!
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Old   May 26, 2010, 07:57
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Hi Dino,

maybe this thread helps:

Suggested unsteady, implicit solver stable with arbitrarily large time steps

stawrogin
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