Numerical Simulation of a Fluid Flow inside the Valve.
Valves are commonly used as fluid flow control equipment’s in many engineering applications. Thus it’s more and more essential to know the flow characteristic inside the valve. This task presents the modelling and simulation of the valves. The three-dimensional numerical simulations were conducted to observe the flow patterns and to measure valve flow rate with different Pressure conditions. The numerically computed results were compared with the experiment data. The medium used in this analysis is water.
The Valve is modeled based on the description of FESTO Manual by using Pro-E. The Valve model consists of Inlet and outlet pipe at start and end of the valve. Due to the position of the piston, the flow between the respective terminals is allowed through vent (circular narrow section). The model is shown below,
Mesh generation is carried out in Hex-dominant parametric method. The mesh consists of two refinement region. In the model, the core valve (piston) region and outlet of the valve region is expected more turbulence than the other region. Thus the two mesh refinement is placed in this two regions. However, the outlet of the valve region is not finely refined like valve region due to the limited the resources availability (number of core hours and time). The final mesh consists of approximately 2 Million cells and all the mesh quality parameters checked and it is fine. The final meshed model is shown below.
The total pressure boundary conditions at the inlet and the fixed value pressure boundary conditions at the outlet. The pressure values (inlet and outlet) are known from the experiment data. The boundary of the valve is considered as a wall with no-slip conditions.For the fluid flow analysis, a Steady-state Incompressible fluid flow analysis type was selected with K-Omega-SST turbulence model. The analysis was carried out on 32 cores and took around 2 hours. The analysis is carried out for two different pressure conditions. The computed results are compared with the experimental data.
The Pressure distribution along the cross section of the valve:
The velocity distribution along the cross section of the valve:
The Streamlines inside the valve: