[Chris123]

Hello,
I tried to change the coordination system from (of course )cartesian to cylindrical via functional object.
I added in the controldict:

functions
{


coordinateSystems
{
type fieldCoordinateSystemTransform;
functionObjectLibs ("libmeshTools.so");
log yes;
coordinateRotation cylindrical;
origin (0 0 0);
writeControl timeStep;
writeInterval 1;
mode magnitude;
fields ( U );
}
unfortunately without success.

Error: --> FOAM FATAL ERROR:
Attempt to return primitive entry ITstream : ...controlDict.functions.coordinateSystems.coordin ateRotation, line 70, IOstream: Version 2.0, format ASCII, line 0, OPENED, GOOD
primitiveEntry 'coordinateRotation' comprises
on line 70 the word 'cylindrical'
Obviously my entry "cylindrical" is wrong but I have no idea how to serve the keyword coordinateRotation and specify cylindricalcoordinates
Any idea?

[tkr]

Do you have any suggestion how to use the function object?
I am trying to perform a transformation from Cartesian coordinates to cylindrical coordinates, where the y-coordinate is the axial component along the domain.

 
coordinateSystem
 {
        type        cylindrical;
        origin      (0 1 0);
            
        rotation
        {
        type        cylindrical;
        axis        (0 1 0);
        }
 }

For me it's not clear what to use for the first "type" and "origin" as well as for the "rotation"-entity.
The function object fieldCoordinateSystemTransform produces an output. However, checking the result doesn't seem plausible.

[palarcon]

I am facing exactly the same problem now, does anybody know how to do it?

Originally Posted by tkr

Do you have any suggestion how to use the function object?
I am trying to perform a transformation from Cartesian coordinates to cylindrical coordinates, where the y-coordinate is the axial component along the domain.

 
coordinateSystem
 {
        type        cylindrical;
        origin      (0 1 0);
            
        rotation
        {
        type        cylindrical;
        axis        (0 1 0);
        }
 }

For me it's not clear what to use for the first "type" and "origin" as well as for the "rotation"-entity.
The function object fieldCoordinateSystemTransform produces an output. However, checking the result doesn't seem plausible.

[olesen]

The coordinate specification itself looks OK, but I generally find the "cylindrical" specification for the rotation a bit confusing.

You should know that the cylindrical coordinate systems were pretty odd/faulty when used to transform fields (the mesh locations were not properly used for the cylindrical coordinates). This was massively reworked for the OpenFOAM-v1812 version and should now be working correctly, I believe.

Here is a reference to a commit with some details:

https://develop.openfoam.com/Develop...237eea184abb46