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Old   November 13, 2023, 04:54
Post Ansys and Openfoam Simulation
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Silvia Sambuca
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Hy everybody,
I am simulating a turbulent airflow flowing in a bypass tube of circular diameter of 0.07 m from a condition of 300 Pa in the inlet and ambient pressure in the outlet (so only pressures are known). I created the mesh (I am attaching an image in here) in ANSYS mantaining a y+ of around 30 (calculated on the target velocity that I would like to reach).
Mesh.jpg

The mesh obtained is quite regular. Then I exported the mesh so that I could use both Ansys (Fluent) calculation and Openfoam. I will attach also the boundary conditions for both solvers.
Finally I tried to mantain same/similar schemes for both solvers: steady solvers and second order schemes for both, same convergence criteria (1e-6) and relaxation parameters (p/k/epsilon 0.4 and U 0.5).
First of all the simulation on Ansys is converging, instead Openfoam not (even though residuals are around 1e-5 at very high iteration number). Even though the values of pressure are comparable (remembering that values of P are in m2/s2 in Openfoam), the values of velocity and so flowrate are very different (0.0450 m3/s in Openfoam and 0.0539 in Ansys). Can somebody explain why these values are so different ?

B.C.Ansys.zip
B.C.Openfoam.zip

Notice that the values of 122 m2/s2 in Openfoam was defined after a first simulation in Ansys, that gave 122 m2/s2 as the value of the static pressure.
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