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[ANSYS Meshing] Simple heat exchanger meshing |
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October 26, 2021, 03:56 |
Simple heat exchanger meshing
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New Member
Join Date: Oct 2021
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Hi everybody,
I tried to set up a fairly simple case in ANSYS Workbench with the solver Fluent. Later on I will solve a heat exchanger, but as this is quite perfomance-demanding I carry out the meshing-study with a simplified model to find out which meshing I should use in the later full model to get a reliable result. My model is a 2D rectangular (0.04 m wide and 1 m long) with a velocity inlet on the left side and a no-pressure outlet on the right. The long walls are my boundaries and both are set to no-slip and a fixed temperature of 20 °C. My inlet temperature is 80 °C and the velocity is high enough to ensure a turbulent flow (Reynolds number above 10000, I use the k-epsilon turbulence model). Now about my actual question. Every time I change the meshing before running the solver, my results change significantly. At first when the mesh is rather coarse that is plausible as such a coarse mesh is presumably not able to solve the boundary layers on both sides. But even if I refine my mesh or add inflation layers at the edges, or even if I generally increase the number of cells, my results keep changing (sometimes with fine meshes they even diverge?). Usually I expect only slight alterations in the solution when I reached the point on which the mesh is good enough, but that never happens. Logically I am mostly interested in the temperature profile and the average outlet temperature, but the other values like pressure and velocity keep changing as well. Is there anything I am doing wrong, any ideas how I can resolve that issue? I am happy about help, it is quite frustrating to spend hours and hours without any progress . |
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Tags |
ansys, convergence, heat exchanger, meshing, workbench |
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