ddt (rho U) + div (rho U U) – laplacian (mu U) = – grad (p)
Swimming is a kind of sports. CFD (Computational Fluid Dynamics) is to analyze fluid flow numerically using computers with some discrete models. Because of movement in water, the resistance generates. In order to decrease the resistance to improve the movement Continue reading Swimming and CFD
Generally, in the explicit schemes of differential method, Courant number is an important number which should be less than 1 in order to assure the stability. However, if the Courant number is too small, much computation time will be lost. Continue reading Run a Case with Variable Time Step in OpenFOAM
Linear Equation Systems are most concerned in modern scientific and engineering computation, because most problems can be described by (partial) differential equations which could be discretized to a system of algebraic equations which can be solved on a computer. There Continue reading Solutions of Linear Equation Systems Used in OpenFOAM
From the “5.12” Wenchuan Earthquake, there has been a heated discussion in China about whether human can predict earthquake or not. Some people think human can investigate animal’s abnormal phenomena, such as sudden migration, to predict earthquake happening, while others Continue reading Can Human Predict Earthquake?
In OpenFOAM, We can simulate fluid dynamics with general meshes, such as tetrahedral, hexhedral, and with polyhedral mesh which workes well in OpenFOAM. Generally, A tetrahedral mesh in a geometric model should be done, which should be converted to the Continue reading How to convert tetrahedral mesh to polyhedral mesh
sonicLiquidFoam is a compressible sonic laminar liquid flow code in OpenFOAM, which is an open-source CFD toolkit. Early, sonicLiquidFoam could not be running with time-dependent pressure. When you set a boundary with timeVaryingUniformFixedValue in the case which could be computed Continue reading sonicLiquidFoam can Run With Time-Dependent Pressure