shear stress on a surface

Araash · October 26, 2019, 05:55

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.

evcelica · November 5, 2019, 15:35

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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November 5, 2019, 15:35		#2
evcelica Senior Member Erik Join Date: Feb 2011 Location: Earth (Land portion) Posts: 1,167 Rep Power: 23	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.