![]() (open Ansys help manual then Shift+Ctrl+D to paste this link) help/ans_thry/thy_geo2.html#geoconsistent (section : 3.3.8. Below two Ansys help theory manual links discuss this concept. The inversion of an unsymmetric matrix takes longer and more memory to compute than a symmetric matrix, because we need to store the full matrix and not only the upper triangular half. ![]() ![]() So when the contribution of stress stiffening and pressure load stiffness matrices are significant in resulting Consistent Tangent Stiffness Matrix for a problem, then NROPT,UNSYM shall lead to better convergence trend. Usually a procedure of symmetrizing the tangent stiffness matrix is invoked and then solved with symmetric Newton Rapshon (NROPT,FULL) solver. The stress stiffening matrix is unsymmetric and pressure load stiffness matrix is also unsymmetric. ![]() Mixed u-P element formulation itself doesn’t introduce unsymmetric stiffness matrix. ![]()
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