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Moving Boundary / Moving Mesh Analysis

In engineering analysis, a moving boundary situation exists in many practical applications. The moving boundary represents a non-stationary computational domain for CFD analyses, which change size and shape with respect to time. In order to resolve the moving boundary, moving mesh (mesh morphing) technology must be embedded in the CFD analysis.

Pipe Valve Moving Meshing Calculations

A valve opening and closing process is a typical example of such an application. In this analysis, the valve’s motion is either defined (controlled) or determined by the momentum balance between the incoming fluid and the valve control mechanism. The analysis starts with the computational mesh at its initial position. When the valve moves, the moving mesh algorithm will automatically move mesh nodes on the valve surface as well as the neighboring nodes to their new locations without user intervention. The opening and closing of the valve controls a certain amount of fluid passing through the control valve. The time-accurate solution is a result of the instantaneous valve location and its corresponding flowfield quantities. Based on this analysis, the engineer can properly determine design parameters like the mass flow rate per opening-closing cycle, the valve position control, etc.

Pipe Valve Moving Meshing Calculations