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Time Steps

Posted 27 mars 2013, 04:41 UTC−4 Fluid & Heat, Computational Fluid Dynamics (CFD), Studies & Solvers Version 4.3a 1 Reply

Nithin Kumar Peratla
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While simulating our case, we have used strict time step with maximum as 1800 seconds. But still, it is taking a time step of 0.1 sometimes. This is making our simulation quite slow during the middle of simulation. As per our observation, we found the process of simulation with good time steps at the beginning but it is taking smaller steps as the simulation is going on.

Is there any way to maintain standard time steps throughout the simulation process??
1 Reply Last Post 27 mars 2013, 11:32 UTC−4
Josh Thomas Certified Consultant
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Posted: 1 decade ago 27 mars 2013, 11:32 UTC−4
The "strict" setting forces the solver to solve at the specified times. But, if the error estimate requires it, additional steps in between these times are possible. This is what seems to be happening in your case. If you want to manually specify ALL time steps and override the automatic error estimate of the time stepping algorithm, you will need to select the Generalized alpha method. Then, select Manual.

Regards,
Josh Thomas
AltaSim Technologies.
The "strict" setting forces the solver to solve at the specified times. But, if the error estimate requires it, additional steps in between these times are possible. This is what seems to be happening in your case. If you want to manually specify ALL time steps and override the automatic error estimate of the time stepping algorithm, you will need to select the Generalized alpha method. Then, select Manual. Regards, Josh Thomas AltaSim Technologies.

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