# A Fresh New Start

RuninChaos.com | Created by Runmin ZHAO
January 24, 2019

# 2D Meshing using snappyHexMesh and extrudeMesh

Find the tutorialsthe key process is extrudeMesh, which extrudes one patch for a certain distance after the 3D mesh is generated. So look for the extrudeMeshDict files in the \$FOAM_TUTORIALS folder...
December 13, 2018

# Check the Grid Resolution in the Outer Region of Fluid Flow in ParaView

The yPlus value is an important index to consider when choosing the grid size for the near-wall region. How about the outer region?The Rule-of-Thumb EstimationThere is a rule-of-thumb estimation fo...
December 13, 2018

# How to Define Time-Varying Boundary Conditions in OpenFOAM

The velocity varying with time can be represented as$$U = As\sin({2\pi{}t}) + l$$inlet_u { type uniformFixedValue; uniformValue sine; uniformValueCoeffs { ...
August 6, 2018

# A Crash Introduction to Near-wall Treatment in RAS Turbulence modelling

A Crash Introduction to Near-wall Treatment in RANS Turbulence ModellingIn the near-wall region, the flow property changes dramatically. The flow region can be divided into three layers,the viscous...
July 31, 2018

# How to Do thin-gap Meshing in SnappyHexMesh

It is often the case that the mesh quality in thin gaps is difficult to control when using snappyHexMesh. Some times there would be no ample mesh layers to fully represent the flow properties in th...