FEM project

This is the project plan for the FreeCAD FEM integration as part of the Development roadmap.

Units

**Units**
Length	Time	Mass	Force	Pressure	Velocity	Density	Energy	Gravity
m	s	kg	kg m/s2	N/m2	m/s	kg/m3	kgm2/s2	9.81
m	s	kg	N	Pa	m/s	m kg/l	J	9.81
m	s	g	mN	mPa	m/s	micro kg/l	mJ	9.81
m	s	Mg (ton)	kN	kPa	m/s	kg/l	kJ	9.81
m	ms	kg	MN	MPa	km/s	m kg/l	MJ	9.81e-6
m	ms	g	kN	kPa	km/s	micro kg/l	kJ	9.81e-6
m	ms	Mg (ton)	GN	GPa	km/s	kg/l	GJ	9.81e-6
mm	s	kg	mN	kPa	mm/s	M kg/l	micro J	9.81e+3
mm	s	g	micro N	Pa	mm/s	g/mm3	nJ	9.81e+3
mm	s	Mg (ton)	N	MPa	mm/s	Mg/mm3	mJ	9.81e+3
mm	ms	kg	kN	GPa	m/s	M	kg/l J	9.81e-3
mm	ms	g	N	MPa	m/s	k kg/l	mJ	9.81e-3
mm	ms	Mg (ton)	MN	TPa	m/s	G kg/l	kJ	9.81e-3
cm	ms	g	daN	10^5 Pa (bar)	dam/s	kg/l	dJ	9.81e-4
cm	ms	kg	10^4 N (kdaN)	10^8 Pa (kbar)	dam/s	k kg/l	hJ	9.81e-4
cm	ms	Mg (ton) 10^7	N(MdaN)	10^11 Pa (Mbar)	dam/s	M kg/l	10^5 J	9.81e-4

Some meshers out there

Netgen very good mesher, LGPL with some library suport
Salome complicated package, hard to get the code we need!?
PythonOCC python library wrapping Salome and Netgen meshers may be the quickest and most complete way to integrate meshers

some solver out there

Calculix
Code-Aster very broad solver with python bindings
PythonOCC python library that also offers a (currently) rough interface to Code_Aster which would also be a quick way to have a 1st working solution