1 | P a g e GRID GENERATION

GRID GENERATION

1. Accuracy Of Results In CFD Computation Greatly Depends On Type Of Grid. 2. Rectangular Grids Is Not Suitable For Irregular Geometry.

3. Sometime Non-Uniform Mesh Is Required To Reduce Computation Time As Well As Better Capture Of Flow Phenomena. 4. Grid Can Be Structured Or Unstructured.

STRUCTURED GRID GENERATION – ALGEBRAIC METHOD

2 | P a g e GRID GENERATION

1.DIVIDE COMPUTATIONAL PLANEINTO m x n CELLS

2. CHOOSE A VALUE OF η3. CALCULATE X4. CHOOSE A VALUE OF ξ5. CALCULATE Y FROM CHOSEN ξ, Y AND X6. REPEAT THE PROCESS USING SUTABLE

ALGORITHM FOR DIFFERENT CONSTANT η

3 | P a g e GRID GENERATION

η X ξ Y

X1 0 Y1

X2 0.1 y2

X3 0.2 y3X4 - X10 0.4….. 1.0 y4

X1 0.0 Y1

X2 0.1 y2

X3 0.2 y3

1

1

1

1

2

2

X4 - X10 0.4….. 1.0

y42

2

O – TYPE GRIDSX = F1 (ξ , η)Y = F2 (ξ , η)ξ = F3 (X , Y)η = F4 (X , Y)

A B BC D A ( PHYSICAL DOMAIN)

A’ B’ B’C’ D’ A’ (COMPUTATIONAL DOMAIN)

4 | P a g e GRID GENERATION

C – TYPE GRID

A B BC D A

A’ B’ B’C’ D’ A’

H – TYPE GRID

A B BC D AA’ B’ B’C’ D’ A’