9. D, F models

9.1. Characteristics of modeling

The D and F models are variants of the C and E modeling where we will replace the non-dissipative time diagram of centered differences by the explicit dissipative diagram of TCHAMWA (with the parameter PHI = 1.05). Unlike the C and E models, we solve here on a physical basis and not on a modal basis (the keyword PROJ_MODAL of DYNA_NON_LINEn is therefore no longer present in the D and F models).