Theory Manual Version 3.4
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Subsection 3.6.10: Body force term Up Section 3.6: Weak Formulation for FSI Subsection 3.6.12: Special Boundary Conditions

### 3.6.11 Fluid traction acting on solid interface

At a fluid-solid interface , the fluid traction acts on the solid surface, , where is the outward normal to the fluid surface. The resulting virtual work on the solid domain is The linearization of this work is given by where are covariant basis vectors on . Similarly, and
The discretized form of these equations is where where and where where
Subsection 3.6.10: Body force term Up Section 3.6: Weak Formulation for FSI Subsection 3.6.12: Special Boundary Conditions