An introduction to pressure-based coupled algorithms that are used by modern CFD codes including ANSYS Fluent, OpenFOAM and ANSYS CFX to address the pressure-velocity coupling in the Navier-Stokes equations.
Timestamps
0:00 Introduction
0:55 Pressure Gradient (Gauss Integration)
6:46 Face Pressure Interpolation
12:15 Example Force Calculation
15:51 Simplified Form
17:22 Segregated Algorithms (SIMPLE, PISO)
19:22 Explicit Pressure Gradient
22:38 Implicit Pressure Gradient
24:28 v Momentum Equation
27:23 Pressure Equation
29:07 Block Matrix
31:53 System Iteration
32:56 Summary
34:20 Outro
Some useful references:
M. Darwish, I. Sraj, F. Moukalled, 'A coupled finite volume solver for the solution of incompressible flows on unstructured grids', Journal of Computational Physics 228 (2009) 180–201. doi:10.1016/j.jcp.2008.08.027
H. Jasak, 'Coupled Flow Solution Algorithms in OpenFOAM', TOBB ETU, Ankara, 23 October 2019.
#pressure-velocity-coupling #cfd #fluidmechanics
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Disclaimer
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The methods, algorithms, equations, formulae, diagrams and explanations in this talk are for educational and demonstrative purposes only. They should never be used to analyse, design, accredit or validate real scientific / engineering / mathematical structures and flow systems. For such applications, appropriate trained, qualified and accredited (SQEP) engineers / scientists should be consulted along with the appropriate documentation, procedures and engineering standards. Furthermore, the information contained within this talk has not been verified, peer reviewed or checked in any way and is likely to contain several errors. It is therefore not appropriate to use this talk itself (or any of the algorithms, equations, formulae, diagrams and explanations contained within this talk) as an academic or technical reference. The reader should consult the original references and follow the verification and validation processes adopted by your company / institution when carrying out engineering calculations and analyses. Fluid Mechanics 101 and Dr. Aidan Wimshurst are not accountable or liable in any form for the use or misuse of the information contained in this talk beyond the specific educational and demonstrative purposes for which it was intended.