[fish man]

I want to use nearWallFields to find the flow velocity at a distance of 0.01 from the model (fish) surface.
However, the settings may have failed, and the velocities for the entire analysis case were saved instead of the specified location.
The save location is in the result file for each second.

The following is a description of nearWallFields in "controlDict".
nearWallFields
{
// Mandatory entries (unmodifiable)
type nearWallFields;
libs ("libfieldFunctionObjects.so");
fields
(
(U U_nearWall)
);
patches (fish);
distance 0.01;

// Optional (inherited) entries
region region0;
enabled true;
log true;
timeStart 0;
timeEnd 100000;
executeControl timeStep;
executeInterval 1;
writeControl adjustableRunTime;
writeInterval 0.01;
}

[Yann]

Hello,

The output of the nearWallFields function object is a volume field, so it is normal to get a whole velocity field. (https://doc.openfoam.com/2306/tools/...earWallFields/)
The only difference is that you will get the near-wall velocity values on your walls instead of 0.

In ParaView, load your model surface patches, and display U_nearWall on it to see the velocity values at the distance your specified.

Regards,
Yann

[fish man]

Hello
Thank you very much.
I now have a better understanding of "nearWallFields".