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- Опубликовано: 10 сен 2024
- We will discuss the algorithm for solving multiphase flow using Smoothed Particle Hydrodynamics. At the end of this lecture, we will also practice a case study using SPH based freeware.
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around 02:00, is P:DV a product? what product is it? thank you
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What is the speed of sound of a particle??
The speed of sound is a parameter in SPH required to ensure that the flow is incompressible. It is not the actual speed of sound in the medium.
Details: Most of the grid-based models the flow of water as incompressible since the speed of sound in water is very high as compared to the bulk motion speed (very low mach number). However, in SPH, the fluid pressure is an explicit funtion of local fluid density and the fluid motions are driven by local density gradients. An artificial equation of state is therefore chosen. The speed of sound thus chosen is low enough to be practical and high enough to ensure incompressibility of fluids such as water at the low mach numbers.
For more details, please refer:
Morris, J. P., Fox, P. J., & Zhu, Y. (1997). Modeling low Reynolds number incompressible flows using SPH. Journal of computational physics, 136(1), 214-226.