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Problem of the boundary condition at bubble surface

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Hi,
I'm now trying to use N-S and continuity equations to calculate the drag cofficient of spherical bubbles.
I use the PDE and 2D axisymmetric model module to simulate. when setting the boundary condition of zero shear stress at bubble surface, I encounter a problem that the boundary condition is "t.T.n=0"as shown in the image.
I wonder if someone knows how to transform this condition so that it can be used in comsol.
I've shown my idea in the image and I'm very pleased if someone gives me any idea about this topic.
Thank you very much.

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