[Goutam]

I have used the following code created by Johan Magnusson. It creates the tool NusseltCalc. Only problem is, when I run NusseltCalc then I got the error:

Command not found. Could you please help me?

I am adding the code as an attachment.

[markusrehm]

Hi,

have you correctly compiled the tool? You need to do a "wmake", see the Wiki for more information on that topic.

Markus

[Goutam]

Dear Members,

This is the code for local Nusselt number:

volScalarField wall_localNusselt
(
IOobject
(
"wall_localNusselt",
runTime.timeName(),
mesh,
IOobject::NO_READ,
IOobject::AUTO_WRITE
),
mesh,
dimensionedScalar("wall_localNusselt ",dimless,0.0)
);

forAll(wall_localNusselt.boundaryField(),patchi)
{
wall_localNusselt.boundaryField()[patchi] = length*patchHeatFlux[patchi]/((T_hot-T_ini)*k);
}

wall_localNusselt.write();
}

I want to write a code for Average Nusselt Number.

[Goutam]

The code was correct. NusseltCalc is working now.

[Goutam]

How to calculate average Nusselt number?

[markusrehm]

DearGoutam,

I have not used the code but it would be helpful to see the error message.

Markus

[Goutam]

Looking for a response?

[markusrehm]

Hello Goutam,

please be a bit more precise. As far as I understand, the code you posted above calculates the patch-averaged Nusselt number.

Because patchHeatFlux should be the heat flux over the patch in [W/m2], right?

Markus

[Goutam]

Dear Markus,

This code will calculate heat flux and Local Nusselt NUmber at each patch. I am using this code and its working properly.

If you want to calculate average Nusselt number, then just write in the terminal window:

patchAverage wall_localNusselt your_patch_name

You will get your average Nusselt number.

Cheers !!!

[giovanni10]

Originally Posted by Goutam

Dear Members,

This is the code for local Nusselt number:

volScalarField wall_localNusselt
(
IOobject
(
"wall_localNusselt",
runTime.timeName(),
mesh,
IOobject::NO_READ,
IOobject::AUTO_WRITE
),
mesh,
dimensionedScalar("wall_localNusselt ",dimless,0.0)
);

forAll(wall_localNusselt.boundaryField(),patchi)
{
wall_localNusselt.boundaryField()[patchi] = length*patchHeatFlux[patchi]/((T_hot-T_ini)*k);
}

wall_localNusselt.write();
}

I want to write a code for Average Nusselt Number.

What does (T_hot-T_ini) stand for ?
-- wall_localNusselt.boundaryField()[patchi] = length*patchHeatFlux[patchi]/((T_hot-T_ini)*k); --

I want to calculate the localNusselt number at a wall which is called "right". I have a rectangular cavity which has 4 walls with the following names: bottom, right, left and top. So, the Nusselt number is calculated as the integration of dT/dx for limits from y=0 to 1, at x=0, which is the "right" wall.
How can I alter your code?
I am using an incompressible Magnetohydrodynamics` solver.
Thanks a lot for your help!