Dimension of mesh

jackdaniels83 · June 19, 2007, 04:24

Hi All,
when i read in a mesh (in my case from gmsh) that is written in millimeters, do i have to scale it by factor 1/1000 in foam to get the right values for U? And how is the surface flow in ParaView written? m³/sec, liter/sec, liter/min or something like that?

I hope one can help me,

Daniel

fra76 · June 19, 2007, 04:31

Everything inside OpenFOAM is treated in meters, kg, seconds, etc...
So, yes, you have to scale the mesh, if it has been generated in millimiters.
The surface flow in ParaView should match the units used inside OF, so I guess it is m³/sec
Francesco

jackdaniels83 · June 19, 2007, 04:52

Thanks Francesco,
that's exactly what i needed to know. Can someone confirm that ParaView is also using the SI units?

Daniel

dmoroian · June 19, 2007, 06:21

ParaView is just a postprocessor, so it doesn't care about units.
This means it will preserve whatever values it receives.

Dragos

June 19, 2007, 04:24	Hi All, when i read in a mesh	#1
jackdaniels83 New Member Join Date: Mar 2009 Posts: 20 Rep Power: 17	Hi All, when i read in a mesh (in my case from gmsh) that is written in millimeters, do i have to scale it by factor 1/1000 in foam to get the right values for U? And how is the surface flow in ParaView written? m³/sec, liter/sec, liter/min or something like that? I hope one can help me, Daniel

June 19, 2007, 04:31	Everything inside OpenFOAM is	#2
fra76 Senior Member Francesco Del Citto Join Date: Mar 2009 Location: Zürich Area, Switzerland Posts: 237 Rep Power: 18	Everything inside OpenFOAM is treated in meters, kg, seconds, etc... So, yes, you have to scale the mesh, if it has been generated in millimiters. The surface flow in ParaView should match the units used inside OF, so I guess it is m³/sec Francesco

June 19, 2007, 04:52	Thanks Francesco, that's exac	#3
jackdaniels83 New Member Join Date: Mar 2009 Posts: 20 Rep Power: 17	Thanks Francesco, that's exactly what i needed to know. Can someone confirm that ParaView is also using the SI units? Daniel

June 19, 2007, 06:21	ParaView is just a postprocess	#4
dmoroian Senior Member Dragos Join Date: Mar 2009 Posts: 648 Rep Power: 20	ParaView is just a postprocessor, so it doesn't care about units. This means it will preserve whatever values it receives. Dragos

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