The Design – Contours of Volume Fraction (Air) Multiphase Simulation | ANSYS Fluent
Cavitation is one of the most important issues that has always been considered by engineers and industrial designers, especially in the field of fluid mechanics.
Cavitation is a phenomenon that often occurs in hydraulic systems under certain conditions, usually due to the lowering of fluid flow pressure range at working temperature. This phenomenon in the long run and at high velocity causes damage and hole on the surface. Damage of cavitation to structures for high velocity, high height dams, and spillways is a permanent problem.
In this project, the phenomenon of cavitation has been modeled and tested by Ansys Fluent software.
Geometry & Grid
The geometry required for this analysis has been generated by the ANSYS Design Modeler software. Meshing for this analysis was also generated by ANSYS Meshing software. The mesh type used in this analysis is all triangles method and the element size of body sizing for this geometry is 0.25 mm.
In this analysis, K-epsilon standard turbulence viscosity model was used to check the fluid flow. The Standard Wall function is also used near the wall. The turbulence multiphase VOF model is activated.
The inlet boundary condition is velocity inlet. In this project, the velocity and volume ratio of water-liquid and air in the inlet change, so the results and the effects that are produced in the cavitation For each item being investigated.
In the outlet, the atmospheric pressure is defined as a pressure outlet, in the outlet the water is only allowed to flow back into the domain.
Discretization of Equations
In this solution, the COUPLE algorithm is used for coupling the velocity and pressure equations. Also, the discretization method used for the momentum equations is Second-Order Upwind.
The Design Services
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