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Simple Question: Transport of Diluted Species
Posted 2012年1月19日 GMT-5 14:22 MEMS & Nanotechnology, MEMS & Piezoelectric Devices, Computational Fluid Dynamics (CFD), Microfluidics 1 Reply
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Hello,
"Transport of Diluted Species" >> "Convection and Diffusion" >> Diffusion >> Bulk Material
What is "Bulk Material"? Choosing "None" or Material I used makes any difference?
Thanks.
"Transport of Diluted Species" >> "Convection and Diffusion" >> Diffusion >> Bulk Material
What is "Bulk Material"? Choosing "None" or Material I used makes any difference?
Thanks.
1 Reply Last Post 2012年1月22日 GMT-5 12:10
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Posted:
1 decade ago
Hi
from my understanding its the static material, i.e. if you have water diffusing in some sand, the bulk is the sand, and the diffusing material is the water => bulk -> sand
But then if the diffusivity Dc is not defined in the bulk material (i.e."sand") then the same user defined diffusivity Dc is used so it seems that there are no changes, however, if the diffusivity is defined in the bulk material selected, then you can switch to the "User defined property group" that I understand is the material variable Dc
Most other fields operate the other way: by default its the material properties that apply, and you can manually override, here its the manual that is the default and you must override specifically 2x to get the material properties used
--
Good luck
Ivar
from my understanding its the static material, i.e. if you have water diffusing in some sand, the bulk is the sand, and the diffusing material is the water => bulk -> sand
But then if the diffusivity Dc is not defined in the bulk material (i.e."sand") then the same user defined diffusivity Dc is used so it seems that there are no changes, however, if the diffusivity is defined in the bulk material selected, then you can switch to the "User defined property group" that I understand is the material variable Dc
Most other fields operate the other way: by default its the material properties that apply, and you can manually override, here its the manual that is the default and you must override specifically 2x to get the material properties used
--
Good luck
Ivar