Hello, I runned a IBM simulation, and turns our boundaries are ignored, leading to no correct temperatures and behaviour. Also I don’t see any other simulation type where devices should not be a solid instead of an hollow shape from the flow region therefore boundaries should be the problem… The si…

Courant number, timestep size, flow velocity, and mesh size are related via this equation : C = \frac{U * \Delta t}{\Delta x} Having a look at the equation, given a certain maximum Courant number that you define in the simulation control, things which can cause the simulation to slow down are: V…

Hello, Boundary conditions cannot be applied to faces which are contacts . If you try to do that (which is the case here), the boundary conditions will be ignored in IBM studies. From your description this sounds like a transient case with a temperature initial condition for the pipe? At the moment…

Hello, Yes it helps thank you! Though many confusing points I think I am ok on a IBM simulation which allow fluids and solids. Also that i don’t do a “negative of the devices” cut from the air flow box otherwise i can’t specify iron material /vs the flow box. SimScale Login Log in …

A 1500 seconds transient run is fairly long, as the time steps can get very small depending on the settings. It’s likely that you won’t be able to reach 1500 seconds in a transient CFD run with a community license (i.e. maximum 30000 seconds of runtime), but some things you can do to speed up the r…

Hello Ricardo, Thank you very much for the feed-back. I review all documentation, redid 3 simulations, they now for sure all get stuck at 5% despite the changes in the simulation control section. Maybe the mesh is not correct. I didn’t see an hex dominant mesh option. The STL file might also be …

Hello , Very interesting thank you. Convective heat flux cannot work though as it is not rotating. Another simulation now running stuck a 5min for only 120 seconds with 5 seconds interval. Shorter time doesnt work also. I think some basics are missing. Is there a way to easily pick a temperat…

Hi @kittynotacat , Sorry for the late reply :slight_smile: We usually ask users to post new questions on new and separate forum posts, could you kindly do that? Best, Igor

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Boundaries conditions ignored in IBM simulation

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kittynotacat April 24, 2024, 7:17pm 8

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