Difference between revisions of "OpenFOAM/C2/Simulating-flow-in-a-Lid-Driven-Cavity/English"

The Lid Driven Cavity file structure

Meshing the Geometry

Solving and post-processing results in Paraview

Plotting & validating results on a spreadsheet.

System Requirement

I am using Linux Operating system Ubuntu version 10.04 .

OpenFOAM version 2.1.0

ParaView version 3.12.0

About Lid Driven Cavity flow

case for validation of a CFD code

A moving wall and three fixedwalls

The moving wall has a velocity of 1 meters per second

discussed in the installation tutorial

0 , constant , and system

and a file describing the physical properties of fluid.

Polymesh contains a file named blockMeshDict

(Note that M and D here are capital)

Now press enter

Let me drag this to the capture area

-cordinates for lid driven cavity

-blocking and meshing parameters

-and boundary patches.

edges and mergePatchPairs can be kept empty

this contains three files

controlDict, fvSchemes and fvSolutions

fvSolution

fvSchemes

fvSolution contains discritization schemes used in run time.

fvSchemes contains equation for solver,

tolerance etc.

Pressure ,Velocity,Temperature etc.

We are using a course mesh here.

and press enter

it will be shown in the terminal

Type paraFoam , Note that F here is capital

and press enter

close this

Note that M here is capital

and press enter

skewness and other parameters

which are associated with the mesh

Note that F here is capital

and press enter

type paraFoam in the terminal

to view the geometry and the results

click on Apply

of the objector inspector menu

for time step,regions and volume fields etc

to view the different boundary regions of Lid driven cavity

initial condition

I will select capital U

dropdown menu change from solid color to capital p or U

which are the initial conditions such as pressure or velocity

I will select capital U

Click on the play button

top left of the active variable control menu

To do this let us plot the U and V velocity

to do this let us plot the U and V velocity.

Select the X axis

I will select the X axis and click Apply

we need to plot the graph for u/U v/s y/L for Reynolds number =100

And click APPLY

Go to file save data

In menu bar go to File > Save Data

save as .csv format

The file will be saved as .csv file

Again click ok

cavity.csv file

Scroll down you can see the cavity.csv file

the U0 (u velocity) and to the right points1(Y-axis) columns

in another spreadsheet

that is u zero by capital U and points 1 by capital L

of spreadsheet

Results obtained from Fluent

Summary

File structure of Lid Driven cavity

Solved lid driven cavity.

Post-processing of results

Validation

Assignment

Change some parameters in the lid driven cavity

• Velocity Magnitude in the 0 folder
• Kinematic viscosity in transportPorpoerties in constant folder

Plot the results of u/U and y/L

This brings us to the end of the tutorial

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