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COMSOL Continuous Casting Example
Posted Oct 12, 2021, 6:31 a.m. EDT Computational Fluid Dynamics (CFD), Heat Transfer, Results & Visualization Version 5.6 1 Reply
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I have a question regarding the Volume force density equations (F_r & F_z) used in this example model:
f = (1-alpha)^2/(alpha^3+epsilon)
F_r = -f.A_mush.u
F_z = -f.A_mush.(w-v_cast)
1) Why do (w-v_cast)? I am not able to understand the physical meaning behind this 2) At a z distance of 0.6 m, alpha (liquid volume fraction) is zero and the z-velocity is 0.0016 m/s which is the same as the casting velocity. But when I plot F_z I don't see it go to zero to further along the z-direction. According to the above equation shouldn't it be zero?