How to Ignore a Term in a Weak Expression (Laminar Two-Phase Flow with Moving Mesh)

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Hello everyone,

I am working with the Laminar Two-Phase Flow and Moving Mesh in COMSOL.

Currently, the weak expression of the free Surface is defined as follows in COMSOL: -spf.pext*(spf.iNx*test(u)+spf.iNy*test(v))-spf.sigma*(test(uTx)+test(vTy))

This corresponds to the following equation: n_i τ_i\=−p_ext n_i +σ(∇_s⋅n_i)n_i−∇_s σ (https://doc.comsol.com/6.2/docserver/#!/com.comsol.help.cfd/cfd_ug_fluidflow_multi.09.141.html)

Now, I would like to ignore the term −∇_s σ (Marangoni effect) in the weak expression.

However, I am not sure how to modify the weak expression correctly to achieve this.

Does anyone have a suggestion on how to do this?

Thank you in advance!


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