10.9.2. Modal Pressure Loads
Modal Pressure Loads generates a pressure on RFlex bodies. This entity is similar to Flex Pressure Loads in FFlex. It is very important to add mode shapes in the desired load direction.
The Patch Set:
Should be defined before creating Modal Pressure Loads
Must belong to a RFlex body.
![../_images/image1744.png](../_images/image1744.png)
Figure 10.110 Modal Pressure Loads dialog box
Patch Set: Defines a patch set.
Report Nodes: Defines the report nodes. The reaction force for each mode can be reported in RPLT as many as the user define. If the check box is unchecked, there is no node data in RPLT.
Base Body Name (Rigid Only): Selects a base body. The base body means that a body is acted reaction force of Modal Pressure Loads and must be a rigid. The default is Ground.
Pressure Direction: Selects the pressure direction as Up or Down.
Preview Pressure Direction: Previews the defined preview direction.
Expression
Pressure: Defines an expression to the pressure by clicking EL.
Use Converged Results: Generalized force by modal pressure load is assumed explicitly by previous step in order to reduce computational time of it. This function is effective under the circumstance that time step is very small. RD solver activates this function in the case that time step is lower than ‘step size criteria’