I am trying to run an indoor air quality simulation of a standard dwelling unit design which I have modified with dust filters and foliage set as perforated plate-type porous material in the window area. The porous materials deal with micrometer-sized values. There doesn’t seem to be any problems in my geometry, although I’ve only been guessing my mesh settings just enough for the volume ratio to be <<100.
I’ve gone through several mesh refinements and simulation runs only to come up with this same error rooting from roughly the same coordinates in my model.
Hi there, this is Fillia
I will try some different settings and be right back!
It seems that the problem comes from the “Mesh Screens” Porous media. How did you calculate the free area ratio for this? If I include these parts in the “Foliage”, then the simulation does not fail for example.
Hi Fillia! Thank you for taking time to check out my project concern!
I came up with the free area ratio of the Mesh Screens by converting the micro-sized hole dimensions of the filter into square meters then dividing that by the total area of the filter itself:
0.6 um sized holes = 2(0.6 um) = 1.2 um2 = 1.2e-12 m2
1.2e-12 m2 / 1.6059 m2 = 7.4724454e-13
please correct me if my math was wrong
This is not the whole free area, just the ratio for a single hole, right?
Yes it seems that was my problem now that you have pointed it out haha
How do you suggest I get the whole free area given the ratio of the single hole?
I am afraid that if you do not know the total free area, you will have to select one of the other methods mentioned here: Porosity & Porous Media | Advanced Concepts | SimScale
Alright, I’ll look into it. Thank you so much!