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Subdomain different timestep

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Old   January 24, 2018, 05:11
Default Subdomain different timestep
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I'm simulating a supersonic flow inside a very big volume (3000 m^{3}). The jet comes from a pressure of 80 bar and reaches the big volume at a pressure of 0.2 bar. I'm simulating a 2D section of the volume and the simulation works, but due to the very big dimensions, the computational time is very huge. That is why I was wondering if there is a way to divide the domain in two different subdomains, I mean, I want to study separately the release domain and the diffuse domain. I want to use the release in a small domain with a very fine mesh and use the results of this simulations as boundary conditions of the diffusion domain (with bigger mesh base size and bigger timestep). Is it possible? I'm studying a transient problem...please help me <3
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Old   January 24, 2018, 12:23
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Sounds like you are wanting to do a co-simulation. From the user manual:

'STAR-CCM+ allows you to couple two running simulations together in a co-simulation analysis. The STAR-CCM+ to STAR-CCM+ co-simulation capability targets simulations involving conjugate heat transfer (CHT), fluid-structure interaction (FSI) or exchange of scalar/vector fields across a coupling boundary.'
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star ccm+, subdomains, transient 2d

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