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shear stress on a surface

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Old   October 26, 2019, 06:55
Post shear stress on a surface
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arash
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hello everyone,
i have a simple 2D problem (i attach a picture of the problem).
left side is velocity-inlet and the right side is pressure-outlet. circle has a constant temperature and the fluid is only water. i want to add hydrophobic boundary condition to the wall(circle) then compare the shear stress on it with the hydrophilic one.
how can i add this boundary condition in fluent?? pls help.
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Old   November 5, 2019, 16:35
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Erik
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I don't think hydrophobic/hydrophilic properties matter with single phase flow, do they? That has to due with multiphase, droplets and contact angles of those droplets I believe. If the entire volume is flooded with a single fluid, then there are no contact angles, the entire surface is covered.
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