Hello, I’m looking for guidance on using geometry created in Autodesk Revit as the imported CAD model. Does anyone have a good process for creating the negative volume extract of a Revit model to be used for CFD meshing/simulation? My experiences so far have been unsuccessful with creating just a …

Hi @jstirling ! I have no experience with Autodesk Revit but would like to suggest another solution. OnShape is able to perform a Boolean Subtraction! By defining the boundaries around the geometry subtracting the starting CAD model from the domain that will be simulated will provide you with the …

Hi @jstirling , I can have a look on your model if you will. I’d use Onshape too to create the negative of your geometry. Let me know if you are interested in! :slight_smile: Bests, Jani

@jhorv_th , would you like my revit model (.rvt) or would you like me to share the Simscale project?

@jstirling , if you could translate it into one of the supported file formats of Onshape ( Supported File Formats ) that would be nice! I’d recommend .STEP if possible.

@jhorv_th , the ultimate main goal of mine is to do all of the pre-processing within Revit prior to importing the geometry into Simscale…but getting this workflow figured out has been a real challenge. I created a public project named “ Carpark_experimental runs_7/9 ”, and uploaded some geometry there…

@jstirling , I created one model for the inner domain which can be found here: Onshape Sign in to Onshape, the #1 fastest growing CAD system in the world with over 4 million users. The .sat file was the winning choice! (I tried it with .iges too, but it didn’…

Thank you @jhorv_th ! If I already had the extruded inlet/outlet features added to my CAD model, I suspect the same thing could be accomplished just by hiding the “outside” surfaces within Simscale before setting up my meshing operation. Is this correct? Maybe I could add all of the faces that are…

You’re welcome @jstirling ! Closing the inlet and outlet is not equivalent to importing the negative of your geometry. Maybe it is fair to say that you need to model the air not the walls. I have no idea why you got that error message but if you share the .sat solid model somehow, then I’ll have a …

Does this link work: https://drive.google.com/open?id=1KJ_MxZPQxO9yV1p83KKrXN8yxCxao9KY

@jstirling , yes, it does. You can find the model under the same Onshape link I sent to you yesterday. It was quite easy to create this model. You can download it as .step and try to upload into Simscale. Let me know if this works. :slight_smile: [image] Best regards, János

CAD geometry from Autodesk Revit

Using SimScale CAD & Meshing

ROHIT_SR October 19, 2019, 6:47am 15

I AM NOT SURE ABOUT .rvt file but can you try to upload on simscale project?
create a new project and try to upload it.
if it not working then inform me. I will help you.

Cheers!
Rohit.

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