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Heat Convection with Air and Water
Posted 02.12.2014, 07:18 GMT-5 Fluid & Heat, Heat Transfer & Phase Change, Computational Fluid Dynamics (CFD), Studies & Solvers 0 Replies
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im trying to do a simulation like in the picture below.
What i expect to see is natural convetion in the Air and Fluid based on the density change in the material.
I already did some simulations with natural convection in a one phase closed cavity, which worked really well.
My assumation to solve this problem is as followed:
1. Approach
- Laminar Flow for Air (spf1)
- Heat Transfer in Fluids for Air (ht1)
- non isothermal Flow for Air(nitf1)
- Laminar Flow for Water (spf2)
- Heat Transfer in Fluids for Water (ht2)
- non isothermal Flow for Water(nitf2)
But how can i couple these two things at the transition boundary (Boundary 1)?
2. Approach
- Heat Transfer in Fluids based on the material in the region ( Temperature Distribution without convection looks well)
But how can i specify the flow if i choose this approach?
With one laminar flow for air and water the solution does not compute right, maybe a problem with the boundary conditions?
If i do it with one laminar flow physic i specify the volumeforce as :
density_air*beta_air*g*(T-Treference)
or in the water region as:
density_water*beta_water*g*(T-Treference)
Is one of the approaches right? Or do i have to do it with the multiphase flow?
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Hello CHZ
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