Homogeneous Cavitation Model Used to Predict Erosion
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This study presents a numerical method using ANSYS-CFX-CFD to predict area of wall near a cavitating flow that may be eroded. It is based on the post-treatment of URANS simulations in cavitant flows. The most RANS calculations are performed with compressible consideration and the introduced cavitation model is one of the recently “homogenous model” that is based on mixture fluid with density (ρm) calculated as function of liquid density (ρliq ), vapour or gas density (ρvap) and vapour or gas volume fraction α .
The numerical result obtained on hydrofoil geometries and compared with experimental works concerning flows characteristics (size of pocket, pressure, velocity). We present here the used cavitation model and the approach followed to evaluate the value of α fixing the shape of pocket around wall before collapsing and we limit this study to evaluate the area of wall that can be eroded by cavitation phenomenon.