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Theory Manual Version 3.6
 Subsection 3.7.3: BFSI Spatial Discretization Up Section 3.7: Weak Formulation for BFSI Section 3.8: Newton-Raphson Method 

3.7.4 BFSI Traction Interface

The virtual work on a biphasic-FSI interface was given in eq. (3.7.1-10). The linearizations of are given by The discretized forms of this virtual work is where The discretized forms of the linearizations are where Note that represents the skew-symmetric tensor form of the bracketed vector.
 Subsection 3.7.3: BFSI Spatial Discretization Up Section 3.7: Weak Formulation for BFSI Section 3.8: Newton-Raphson Method