[sajad6]

hi
I want to solve a free sream over 2 block and the condition is steady and laminar and the fluid is incompressible.the problem's picture is attached below.
My porpuse is to calculate Nusselt number of 2 blocks in boundry of fluid.
the tempereture of blocks is constant and is equal to 60 'c.
which solver is better for my problem?how can I use this solver for my porpuse in order to calculate Nusselt number.

[nimasam]

well Dear Sajad
you can use bouyantBoussinqSimpleFoam for simulation.
for calculation of Nusselt Number you can use swak4Foam
or look for written codes in forum

[ranasa]

Hi dear friends

I'm gonna simulate a 3D buoyancy driven flow over a cylinder and want to calculate nusselt number over this patch (i mean cylinder)

i use swak4foam and added these expressions to the end of controlDict file,



lib
(
"libFVFunctionObjects.so"
);

function
{

NusseltNumber
{
functionObjectLibs
(
//"libsimpleFunctionObjects.so"
"libsimpleSwakFunctionObjects.so"

);
type patchExpression;
outputControlMode timeStep;
outputInterval 1;
patches
(
cyl
);
verbose true;
variables
(
"T_inf=300;"
"D=0.00762;"
);
expression "D*snGrad(T)/(T-T_inf)";
accumulations
(
average
);
log true;
}


}

it begins running without any error. The question is here, how can i see the results for nusselt number? should i enter some commands in terminal while iterating or wait until the solution is over?

looking forward to your helpful comments
thanks

[nimasam]

the average nusselt number is written in a file in the test case folder, you can see the result in excel software or plot it using gnuplot

[vnarayana]

NusseltCalc code has done. I am using buoyantBoussinesqSimpleFoam. for post processing results
Do i need to change transportProperties/ControlDict file ?
functions
(
probes
{
type probes;
name probes;
functionObjectLibs ("libsampling.so");
probeLocations
(
(0.025627 0 -0.00023237)
(0.0518278 0 -0.000461021)
);
fields
(
NusseltNumber
);
mode magnitude;
outputControl outputTime;
outputInterval 1;
}
);
i could not get the results, if you have any idea please send the file. Thank you. Recently i started my work with OpenFOAM.

[cfd lover]

i have calculated my nusselt number over a duct.
first you need to make changes in controldict and then define the relation to calculate the nusselt number.
Here is my files