CFD into FEM eventually
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Name = Water
Description = Standard distilled water properties at 20 Degrees Celsius and 1 atm
MolarMass = 18
Density = 998 kg/m^3
DynamicViscosity = 1.003e-3 kg/m/s
KinematicViscosity = 1.005 m^2/s ; only one viscosity is needed, KinematicViscosity = DynamicViscosity/Density
;VolumetricExpansionCoefficient should be VolumetricThermalExpansionCoefficient , correct in next commit
VolumetricExpansionCoefficient = 2.07e-4 m/m/K
SpecificHeat = 4.182 J/kg/K
ThermalConductivity = 0.591 W/m/K
;ThermalExpansionCoefficient is only meaningful to solid, VolumetricThermalExpansionCoefficient = 3 ThemalExpansionCoefficient
oliveroxtoby wrote:I feel this issue is rather complex and we perhaps need to leave it to stew for a while and see how things mature? I am starting to worry that at this stage of our involvement with FreeCAD we are going beyond our remit diving too deeply into this.
Qingfeng, as you suggest we will happily push the interim matprop editor we made, but in my opinion we should leave this in CFD as an interim measure rather than pollute the FEM workbench with another contender. I stress this need only be an interim measure to allow us to concentrate on what we need to get done. Your solution looks like a very good way to handle fluid matprops in the FEM WB, but our worries are how well this would integrate with the CFD solvers.
This raises a question that I'm not really clear on: I know we are trying to share code between the FEM and CFD workbenches, but is this just to avoid duplication or is it actually the plan to integrate CFD into FEM eventually? I was under the impression they were going to remain separate modules.
Thanks for your patience!
vdwalts wrote:I see in some of the freecad wiki documentation that the proposed format for the documentation of material properties was xml (http://www.freecadweb.org/wiki/index.php?title=Material_data_model). So I was just wondering if all the materials somewhere in the future could be standardised in the non-proprietary, generic xml markup language 'MatML' as developed by NIST?
There is already a link to [url]matweb.org[/url] on the materials gui in FEM, whose material properties are given in MatML format.
This would ease the importing and exporting of materials from standard libraries and be able to support all the different types of materials ie mechanical, thermal, fluidic etc. And it will also enable the interoparbility of materials between different software packages.