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Hello, I am trying to perform a quasi-static simulation using radioss. The initial model entailing solely hyper-elastic materials is working fine. Now I replaced a material type 42 with material type 37 that is a bi-phase material. My problem is that when enabling a mass scaling through /DT/NODA/CST in order to reduce the kinetic energy of the model and perform a quasistatic analysis, the model doesn't follow the requested time step. And then the solver stops due to negative volumes. Is there a way perform a quasistatic FSI with radioss? If so which are the appropriate values for MAT37? Is it better to choose a different material? or it isn't possible to perform such an analysis and thus move it to acusolve. Here is my .hm file Quasistatic_indentation_fluid.hm