Theory Manual Version 3.4
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Subsection 7.7.2: Penalty Method Up Section 7.7: Tied Multiphasic Contact Section 7.8: Tied Fluid Interface

### 7.7.3 Discretization

The contact integral may be discretized as The variables may be interpolated over each element face according to Then, where Similarly, where and
Subsection 7.7.2: Penalty Method Up Section 7.7: Tied Multiphasic Contact Section 7.8: Tied Fluid Interface