For systems that can be assumed isentropic, where the acoustic changes in the entropy are zero, enter an expression for the pressure p_user and the density p_user/lef.c0^2. This corresponds to the classical relation . This is also achieved using the Pressure (Isentropic) condition.
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Prescribed velocity (SI unit: m/s). If this check box is selected, choose one or more of these additional check boxes: Prescribed in x direction upx, Prescribed in y direction upy, or Prescribed in z direction upz (for 3D components); or Prescribed in r direction upr and Prescribed in z direction upz (for 2D axisymmetric components).
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