Coupling solid/fluid heat transfer
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Hello,
I have been trying to model convection between an array of cooling fins and air flow for awhile and am stuck on creating interface boundary conditions. I would like for there to be heat transfer between the solid and the fluid. When Fluent creates the interfaces, it merges my chip base and the cooling fin, and then creates 4 interfaces. I am not sure if I am specifying the boundary conditions correctly. Does anyone have advice on this? When I perform the calculation, I am unable to achieve convergence for continuity (it flattens out with residuals ~0.5) and for momentum the residuals flatten out higher than 10^-3. I have tried multiple ways to get continuity to have better convergence, but have not yet found a way. edit: the energy equation also completely diverges after ~ 100 iterations Another spot where I may be doing this incorrectly is that I specify a velocity inlet, then call all other outlets pressure outlets with gauge pressure 0 Pa. Is this a good idea? I have listed out my steps **only** for clarifying my questions above. I understand that it may be too long winded (I believe my error is in the physics set-up though). Thank you in advance for any advice offered. My steps are: In Geometry: 1. Create base of solid by drawing rectangle with dimensions 50 x 50 mm 2. Extrude by 1 mm using “Add Material” operation 3. Create new coordinate system 1 mm high in the z direction, 25 mm in the x and y directions (ie, on the top-middle of the base) a. Create new sketch:4. Returning to the original plane, to create fluid domain: a. Create new sketch5. Create a Boolean with the “Subtract” operation a. Target Body: FluidAt this point the model looks like the included image. In Meshing: 1. Name one fluid Face “Inlet” 2. Name fluid wall that connects to base “fluid bottom” 3. Name all other fluid faces “outlet 1”, “outlet 2”, etc. 4. Name the fin walls “Fin Wall” 5. Name the base walls “Base Wall” In Physics (Double Precision): 1. Energy – On 2. Viscous – Laminar 3. Materials: a. Air: Ideal gas4. Mesh Interfaces a. Create interface between interface zone 1: “base_wall-contact_region-src”,”fin_wall-contact_region-src”, and interface zone 2: “contact_region-trg”(why do5. Boundary conditions a. Inlet: velocity of 3 m/s6. Solution methods a. Scheme: coupled7. Solution Initialization: a. Calculate from inlet |
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These are the boundary conditions that are created. All of the ones starting with "coupled1" are created when I select that the interface is coupled. |
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