BlockMesh by Divyesh Variya (DD Fluids)
- contributor: Divyesh Variya
- affiliation: Indian Institute of Technology, Bombay
- contact: click here for email address
- OpenFOAM versions: v2012
- Published under: CC BY-NC-SA license (creative commons licenses)
- YouTube channel: DDFluids
- LinkedIn Profile: DivyeshVariya
Contents
blockMesh
The blockMesh is a very simple and powerful tool or utility of OpenFOAM to create simple 1D/2D/3D geometries and mesh it. In this tutorial series a detailed overview is given using a lid driven cavity case.
All major sections of blockMeshDict are discussed with different hands on modifications. In addition an explanation of the sub-section edges & mergePatchPair of blockMeshDict is explained in these tutorials. How one can create an arc and polyline using edges section and merge two blocks using mergePatchPair section is discussed with hands on modifications. Additionally, this tutorial describes how one can create finer mesh near a particular face in blockMeshDict, simpleGrading is used.
blockMeshDict [vertices|blocks|boundary]
Tutorial link: YouTube Tutorial
Description: A detailed overview explained in this tutorial using a lid driven cavity case. The three major sections of blockMeshDict are discussed with different hands on modifications.
Points covered:
- How to define vertices
- How to define block
- How to discretise a domain
- How to define physical boundaries
- How to scale geometry
blockMeshDict [edges]
Tutorial link: YouTube Tutorial
Description: An explaination of a sub-section edges of blockMeshDict is explained in this tutorial. How one can create an arc and polyline using edges section is discussed with hands on modifications.
Points covered:
- How to create a curved face
- How to create 3 point arc
- How to create a polyline
- How to create finer and smoother face
- How to add points from excel to blockMeshDict
blockMeshDict [simpleGrading]
Tutorial link: YouTube Tutorial
Description: To create finer mesh near a perticular face in blockMeshDict, simpleGrading is used. In this tutorial, few options of simpleGrading are explained for example, how to create finer grid near the single face and two faces.
Points covered:
- How to create finer grid near a face
- How to distribute geometry and no. of cells
- How expansion ratio work in blockMeshDict
blockMeshDict [Multiple blocks]
Tutorial link: YouTube Tutorial
Description: This video tutorial covers how to define multiple blocks for slight complex geometries in blockMeshDict. For demonstration, T-shape geometry is created and four blocks has been added. For better understanding try to add one more block below and make a "plus" shape geometry by yourself.
Points covered:
- How to add vertices for extra blocks
- How to add multiple blocks
- Tip-1: Always sketch your geometry first
- Challenge: Add one more block and create "plus" shape geometry
blockMeshDict [mergePatchPair]
Tutorial link: YouTube Tutorial
Description: This video tutorial explains when and how to use mergePatchPair function in blockMeshDict file. Using two blocks we can create a T-shape geometry where two separate blocks will merge into one.
Points covered:
- How to add vertices for extra blocks
- How to add multiple blocks
- How to define patches in mergePatchPair
