Check Valve

Check Valve (Dynamic Mesh) — ANSYS Fluent CFD Simulation

Description

This project simulates the flow behavior of a check valve using the Dynamic Mesh capabilities of ANSYS Fluent. A check valve allows flow in one direction only, opening and closing in response to the fluid itself — a coupled interaction where the flow drives the valve's motion and the valve's position in turn shapes the flow. Capturing this means letting the valve move under the forces acting on it while the mesh deforms to follow. Within the Dynamic Mesh: Beginner CFD Training Package, this project introduces flow-driven valve motion, where the moving part responds to the flow rather than following a prescribed path, and adds multiphase flow to the dynamic-mesh toolkit.

Methodology

The geometry — a pipe fitted with a check valve — is created in Design Modeler and meshed in ANSYS Meshing. The dynamic mesh implementation applies the Six Degrees of Freedom (6-DOF) solver to compute the valve's rotational motion from the fluid forces, with deforming mesh zones that adapt as the valve moves and rigid body motion defined for the valve itself. The simulation is enriched with several advanced techniques: a multiphase Volume of Fluid (VOF) model for water and air, time-dependent flow behavior through a transient solver, and Execute Commands to control the inflow conditions. Together these capture the coupled fluid–valve interaction that governs unidirectional flow through the valve.

Analysis

Post-processing focuses on the water mass-fraction contours, along with animations of the valve movement and flow behavior that verify the check valve operates correctly — opening to allow forward flow and closing to prevent reverse flow. From these results you can study how the flow drives the valve's motion, how the valve regulates the flow direction, and how the two phases move through the system. By the end of this project, you'll be able to set up a dynamic-mesh simulation with the 6-DOF solver for flow-driven valve motion, couple it with a VOF multiphase model, use Execute Commands to control inflow, and interpret the results that confirm correct check-valve operation.