reactingFoam - species do not move
 

I am running a very simple pipe flow with reactingFoam. Inlet - wall - outlet. The thermochemistry setup is the same as for the reactingFoam tutorial. I see the velocity and pressure going through the pipe with time as one would expect, but not the species. My initial setting is 100% N2 in the volume and I am setting air for the b/c at the inlet. I should see O2 being convected into the pipe. Species equations are being solved and written, but the species' values remain almost unchanged. I tried to increase the initialChemicalTimeStep, to no avail.
I seem to be missing out the obvious thing. Thanks for suggestions.

I found the mistake: the mesh was written in mm instead of m.

I take the path freeCAD - gmesh - engrid - openfoam. Although the step file from freeCAD was correctly written in m, gmesh wrote the mesh out in mm which later openfoam interpreted as m.

remedy: transformPoints -scale '(0.001 0.001 0.001)'

It is always a good idea to check the points file for the correct units.

If someone knows how to set the default in gmesh permanently to meters, please answer to this post.