ddt (rho U) + div (rho U U) – laplacian (mu U) = – grad (p)
The PISO (Pressure Implicit with Splitting of Operators) is an efficient method to solve the Navier-Stokes equations in unsteady problems. The main differences from the SIMPLE algorithm are the following[1]: No under-relaxation is applied. The momentum corrector step is performed Continue reading pisoFOAM
Now, let’s look at how the simpleFOAM works. the simpleFOAM.C file: #include “fvCFD.H” #include “singlePhaseTransportModel.H” // transport model with viscosity model #include “RASModel.H” // turbulent model // * * * * * * * * * * * * * Continue reading simpleFOAM
[1] MacCormack R W. A perspective on a quarter century of CFD research.AIAA-93-3291-CP,1993 [2] Roache P J, Chia K, White F. Editorial policy statement on the control of numerical accuracy.Journal of Fluids Engineering,1986,108(1):2 [3] AIAA. Editorial policy statement on numerical Continue reading A list of reference paper of verification and validation in CFD
OpenFOAM is one of the most famous open-source CFD toolbox, which current version is 1.6. In this version, there are some aspects changed, like: solver syntax, time-dependent vector boundary, integrating some flow models. Here, I will show you how to Continue reading Time-Dependent Vector Boundary Conditions in OpenFOAM
Valid ddt schemes are : ( CoEuler boundedBackward SLTS CrankNicholson steadyState Euler backward ) The format style for ddtScheme is: ddtScheme { default Euler; } for CrankNicholson, it is: default CrankNicholson 1; where, 1 represents the scheme is Continue reading Discrete Schemes 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