TELEMAC-MASCARET Forum: VARIABLE TIME-STEP in TELEMAC3D (1/1)

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TOPIC: VARIABLE TIME-STEP in TELEMAC3D

VARIABLE TIME-STEP in TELEMAC3D 8 years 7 months ago #20813

MARON Philippe	Hello, In Telemac2d, we can use VARIABLE TIME-STEP keywords. Is there something similar in TELEMAC3D ? I don't find this keywords in telemac3d.dico Thanks for your answer Regards Philippe
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VARIABLE TIME-STEP in TELEMAC3D 8 years 7 months ago #20818

riadh

Hello Philippe

As far as I know, this option is not implemented in Telemac-3D. Variable time step depends on the defintion of a stability criterion (such as CFL for 1D and 2D) for explicit advection schemes.
For 3D, some advection schemes are explicit and then they are conditionally stable (all MURD-based schemes). You can use this stability condition and then introduce (exactly in the same way as in 2D (subroutine Telemac2d.f from line 1455 to 1472)) variable time step option.

Usually, variable time step is often used for mesh comvergence studies when user fixes the CFL for increasingly refined meshes. For 3D studies, this kind of h-convergence is also important. However, people consider very often, the effect of the number of planes separately of the the one of 2D mesh refinement.

I hope that this helps

with my best regards

Riadh Ata

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