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-   -   Cooling simple 3D geometry problem (http://www.cfd-online.com/Forums/fluent/40949-cooling-simple-3d-geometry-problem.html)

Luk May 12, 2006 09:03

Cooling simple 3D geometry problem
 
Dear all, I am very fresh Gambit/Fluent user and need to solve a CFD simple problem on the lend computer. My geomery is very simple: I have (created in inventor and exported as .stp) solid it and cylinder matching this hole that symobolics volume of water. I want to simulate cooling of the solid by water that flows through it. I am playing with this for a long time but noticed no interaction between solid and fluid despite patched temperature difference. I guess that problem is in meshing/setting boundary conditions of the "pipe". Can anyone describe way to mesh it properly in gambit? I tryed to do: - load a solid and subtract a cylinder (to get a solid with hole) and than add a cylinder as a second volume. After that set BC's and mesh - load a solid and cylinder without subtracting and mesh it.

None of these tryes give any "cooling" result in final solution (nor Fluent notices any shadow faces). I would be very grateful for any help, With best regards, Lukasz

Luk May 12, 2006 09:09

Re: Cooling simple 3D geometry problem
 
Sorry for mistakes, in second line should be "solid and cylinder". The mistake is because I was trying to make solid with hole to avoid subtraction in Gambit.

philipov May 12, 2006 09:24

Re: Cooling simple 3D geometry problem
 
You do not need the cylinder. Just set the inner surface of the solid to be BC as constant temperature (the temperature of the fluid).

Luk May 12, 2006 09:39

Re: Cooling simple 3D geometry problem
 
Dear Sir, I am not quite sure If I understood You well. I assumed that fluid (Water) will be heated by surrounding hot block (which, in turn will be cooled down). So I though that I need fluid zone inside. In the end I am interested in cooling ratio of the block and leaving water temperature as a function of time.

Luk

philipov May 12, 2006 09:47

Re: Cooling simple 3D geometry problem
 
If you want , send me a scheme of your task and I'll write down what can be done. As I understood you want to see temperature of the fluid and temperature of the solid also. If you do not have fluid flow, then just write: M(fluid).cp(fluid).(t1-tx)=M(solid).cp(solid).(tx-t2)


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