I have created a model in autocad. I wish to simulate fluid flow in it(a porous media). it is a mdoel of grain particles. the problem is that at the import stage,i am getting error message that the file could nt be written. i am new to comsol and dont exactly know how to go about this.i have used the live link for autocad to import but still get this message.when i save the autocad job as dwg,it does not even come up for me to select at all.i get messages like no current valid file is open in autocad.i only have a chance when i save as dxf.its a 3d model.can any one help me out please
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