Fluid Penetration Pressure

Use the Fluid Penetration Pressure command to define a fluid pressure load that is restricted by contact pressures in your solution.

At the beginning of each time step, if the contact pressure is below the Contact Pressure Tolerance, the software considers an element edge or face to receive the fluid pressure. If the contact pressure is below the threshold, at least one of the nodes connected to the element edge or face must either be a Fluid Path Starting Point, or it must be connected to an element in which the fluid pressure is active.

For any element edges and faces that you define as Potentially Wetted Surfaces, that are not referenced by a contact pair defined by the Surface-to Surface Contact command or the Edge-to-Edge Contact command, the software determines their contact pressure to be 0 and applies the fluid pressure if they are in the active flow path from one of the defined starting points.

Fluid pressure moves into the interface as contact pressure relaxes

Determining contact status for unaligned or asymmetric regions

For SOL 402, if the meshes of the source and target regions are not aligned or symmetric, you can select the method for determining contact status. Selecting the appropriate method ensures that pressure loads on the source and target regions are equivalent. In general, for small to medium tangential displacement, use the standard contact-based method. For large tangential displacement, use the topology-based method. For details on both methods, see Fluid Penetration Pressure dialog box (Nastran).

Note:

SOL 401 uses a different method than SOL 402 for determining contact, and selecting a method is not necessary.

Where do I find it?

Application	Pre/Post
Prerequisite	A Simulation file as the work part and displayed partSimcenter Nastran as the specified solverStructural as the specified analysis typeSOL 401 Multi-Step Nonlinear or SOL 402 Multi-Step Nonlinear Kinematics as the specified solution type
Command Finder	Fluid Penetration Pressure

Learn more

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Non-Structural Mass (Nastran)

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Fluid Penetration Pressure, Simcenter 3D 2021.1 Series

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