# Boundary condition "flow over a cylinder"

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August 26, 2009, 10:05
Boundary condition "flow over a cylinder"
#1
Member

toto
Join Date: Jun 2009
Posts: 71
Rep Power: 10
Hi,

In this example the flow over a cylinder is modeled . The domain is 2 dimensional. The cylinder, which is perpendicular to the flow, is modeled as a circle and a rectangular flow domain is created around the cylinder. For this example, we will consider Air as the fluid medium.

1. Which solver is adequate in this case (tubForm, icoForm or simpleFoam)?
2. How could i chose an adaquate Time-Step to get resonnable Courant-Number during the Simulation

My boundary conditions in 0/U looks like(IcoFoam)

dimensions [0 1 -1 0 0 0 0];
internalField uniform (1 0 0);
boundaryField

inlet
{

type fixedValue;
value uniform (1 0 0);

{
outlet
{

}
inlet
{

type fixedValue;
value uniform (1.5 0 0);

}
cyl_wall
{

type fixedValue;
value uniform (0 0 0);

}
wall
{

type symmetry; // I donīt no (no-Slip)

}
frontAndBackPlanes
{

type empty;

}

p/U looks like

inlet
{

type fixedValue;
value uniform (0 0 0);

{
outlet
{

type fixedValue;
value uniform 0;

}
inlet
{

}
cyl_wall
{

type ............; // I donīt no

}
wall
{

type ............; // I donīt no

}
frontAndBackPlanes
{

type empty;

}

3. What about fvScheme, fvSolution ?

Please just help me to solve this Problem!
Thanks
Attached Files
 2D_case.doc (33.5 KB, 21 views)

February 8, 2011, 06:11
#2
New Member

lyes
Join Date: Feb 2011
Posts: 24
Rep Power: 8
Quote:
 Originally Posted by ronaldo Hi, In this example the flow over a cylinder is modeled . The domain is 2 dimensional. The cylinder, which is perpendicular to the flow, is modeled as a circle and a rectangular flow domain is created around the cylinder. For this example, we will consider Air as the fluid medium. 1. Which solver is adequate in this case (tubForm, icoForm or simpleFoam)? 2. How could i chose an adaquate Time-Step to get resonnable Courant-Number during the Simulation My boundary conditions in 0/U looks like(IcoFoam) dimensions [0 1 -1 0 0 0 0]; internalField uniform (1 0 0); boundaryField inlet { type fixedValue; value uniform (1 0 0); { outlet { type zeroGradient; } inlet { type fixedValue; value uniform (1.5 0 0); } cyl_wall { type fixedValue; value uniform (0 0 0); } wall { type symmetry; // I donīt no (no-Slip) } frontAndBackPlanes { type empty; } p/U looks like inlet { type fixedValue; value uniform (0 0 0); { outlet { type fixedValue; value uniform 0; } inlet { type zeroGradient; } cyl_wall { type ............; // I donīt no } wall { type ............; // I donīt no } frontAndBackPlanes { type empty; } 3. What about fvScheme, fvSolution ? Please just help me to solve this Problem! Thanks
hey I'm begineer in fluent and i 'm working on simulation of flow and heat transfer in a horizontal rectangular channel were i have heat souces mayb u help me to simulate that problem i have experimental results to valid the numerical result lyes43@yahoo.com

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