[vigges]

Hi Foamers,

my simulation is running smoothly but now, I'm facing the next problem.
I need to find the maximum Nusselt number on my wall patch and its location, so that my further calculations can be executed.

I thought about hacking something into the patchAverage utility, in order to get the average Nusselt number and the maximum's location at the same time. Unfortunately, I have no clue how to do that.

Do you have any ideas?
Thanks in advance.
Victor

[Gwenael]

Did you look into foamCalc ?

[vigges]

Yes, I did. But afaik, it's not capable of determining the maximum value on a patch or its exact location on the patch.
I'm sure there is a solution but it would most likely involve programming in C... Let's say that is not my strong suit

[gschaider]

Everybody run: Bernhards usual answer

Originally Posted by vigges

Yes, I did. But afaik, it's not capable of determining the maximum value on a patch or its exact location on the patch.
I'm sure there is a solution but it would most likely involve programming in C... Let's say that is not my strong suit

Recent versions of swak4Foam have a function maxPosition that gives you the location of the maximum on a patch. So something like (I'm doing this from memory)

functions {
    extremeP {
       type swakExpression;
       valueType patch;
       patchName wall;
       verbose true;
       expression "p";
       accumulations (min max);
    }
    maxPPosition {
      $extremeP;
      expression "maxPosition(p)";
      accumulations (average);
    }
    minPPosition {
      $maxPPosition;
      expression "minPosition(p)";
    }      
}

would give you minimum and maximum of p as well as their positions on the patch during the simulation.

Advantage: you don't have to program C++
Disadvantage: you'll have to pollute your machine with swak4Foam

[vigges]

Bernhard, thanks a lot!!
I'm going to look into that.

[vigges]

Works perfectly :-)

Let's assume that only the final time step's max location is needed. Is it feasible to only export this value/location to a file?

[gschaider]

Originally Posted by vigges

Works perfectly :-)

Let's assume that only the final time step's max location is needed. Is it feasible to only export this value/location to a file?

funkyDoCalc can be used to specify calculations in a file and execute them on saved data.

@file: there should be some directories named swakExpression_foo there with the data (not 100% sure whether funkyDoCalc creates them)