Assignment for the course CFD with OpenSource Softwarehani/kurser/OS_CFD_2012/... · Assignment for the course CFD with OpenSource Software Hamed Jamshidi Fluid Dynamics Devision,

Solver#1 icoFoam Solver: interFoam/laminar Solver: simpleFoam

Assignment for the courseCFD with OpenSource Software

Hamed Jamshidi

Fluid Dynamics Devision,Applied Mechanics Department,

Chalmers University of Technology,Gothenburg, Sweden

2012-09-09

Hamed Jamshidi Assignment 1 2012-09-09 1 / 11


case: cavity

Results of cavity Case

The flow over a cavity with 1 m/s velocity at the top is solved by icoFoamwhich solves the incompressible laminar Navier-Stokes equations using thePISO algorithm. The code is inherently transient, requiring an initialcondition and boundary conditions.

Mesh andVelocity field

Streamlines coloredby velocity mag.



case: cavityFine

Results of cavityFine Case

The same geometry as previous case is simulated using finer mesh. This couldbe done by changing the number of cells in the blockMeshDictfile in thefollowing part:blocks(hex (0 1 2 3 4 5 6 7)(20 20 1) simpleGrading (1 1 1));



Scaled Arrowsof Velocity



case: cavityHighRe

Results of cavityHighRe Case

Simulation of high Reynold flow inside the same cavity could be done bydecreasing the kinematic viscosity. This could be done by changing in thetransportProperties file which is in the constant directory in the followingpart:nu nu [ 0 2 -1 0 0 0 0 ]0.001;





case: cavityGrade

Results of cavityGrade Case

As seen in the following figure in this case the mesh is ‘graded. This could bedone by changing the blockMeshDict file in the following part:blocks(hex (0 1 2 3 4 5 6 7) (20 20 1) simpleGrading (2 2 1));

Mesh andVelocity field Streamlines colored

by velocity mag.Hamed Jamshidi Assignment 1 2012-09-09 5 / 11


case: cavityClipped

Results of cavityClipped Case

In this case we use mapFields utility with the mapFieldsDict as follow:patchMap ( lid movingWall );cuttingPatches ( fixedWalls );



Non-scaled Arrowsof Velocity



case: damBreak

Results of damBreak Case

In this case we use setFields utility with the setFieldsDict that should bemodify for this problem

Mesh and Vorticity mag.

Mesh and Phases at t=1s



case: damBreakFine

Results of damBreakFine Case

To have a better simulation some times the number of cells should beincreased. Different charactristics of blockMesh utility could be controlledby blockMeshDict.

Phases Velocity Plot



pitzDaily

Results of pitzDaily Case



MirrorMesh

mirrorMesh Utility Usage

This utility mirrors a mesh around a given plane specified in themirrorMeshDic. This plane could be defined in 3 different ways as follow:1. planeEquation2. embeddedPoints3. pointAndNormal

One of these should be defined.For example by defining a plane asplaneType pointAndNormal;pointAndNormalDict{basePoint (0 0 0);normalVector (0 1 0);}For cavity case the resulting mesh would be like the figures in next page



MirrorMesh

Mesh Velocity Field


Documents

Assignment for the course CFD with OpenSource Softwarehani/kurser/OS_CFD_2012/... · Assignment for the course CFD with OpenSource Software Hamed Jamshidi Fluid Dynamics Devision,