Calculation of stress tensor on wall particle (turbulence)

HI

To resolve the turbulent viscous term, we need to compute tau_a and tau_b where tau is the stress tensor.

The computation above seems reasonable if a and b are fluids.

However, if a fluid particle "a" interacts with a solid particle "b", may I know how dualsphysics computes tau_b?

Can someone please enlighten?
Thanks.
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