At first glance I can tell you that the surfaces of your house need to be split. Are you working on an indoor analysis or trying to couple CFD with an FE analysis?
Best,
Jousef
How could be split the surfaces?
It is possible to split it directly with simscale?
It is a outdoor CFD simulation
Thanks
Andreas
Hi Andreas,
This is indeed possible however I cannot make it work. I also assume that your geometry might not be watertight as I can see some line that separates the floor and the rest of the building if I am not mistaken? You can split the building inside your CAD software or use Onshape if you have used this before. Let me know how things go!
Best,
Jousef
Thanks.
I will try to split the geometry later…it is late here in Italy 
It is the same if I use STP or STL?
Could you send me link of a video tutorial of a similar project?
Regards
Andreas
Hi Andreas,
These formats are indeed not the same and STEP usually comes “already split”. You could convert the file and re-upload it. For the split operation there is no special example but if you imagine a cylinder that consists of one whole solid you could split that using the geometry operation otherwise you could not assign the boundary conditions separately. Does that make sense? If not I can upload an example to show it properly.
Best,
Jousef
1 Like
Hi Jousef,
just before I found indication how split geometry
Here the link: How to Split an STL geometry into different faces
This operation is tipicaly if for users that use STL.
At least I was not able to split surfaces with simscale, here the notice after several trials
The STL file contains at least one edge where three triangles join (it describes a non-manifold surface). This might lead to issues in the downstream workflow (e.g. splitting in separate faces will not be possible, mesh generation might fail). To be safe, upload an STL in which at most two triangles share one edge.
I think Archicad is not the best option for SimScale but it is my only option to realize 3d models
Regards
Andreas
Hi Andreas!
Have you tried converting your file with Onshape or any other tool? You can send it to me via mail (jmurad@simscale.com) and I will try to convert it with a tool on my machine.
Best,
Jousef
Hi @at79
Is this what you wanted 
?? If yes, here is the link to that file- https://drive.google.com/open?id=173-2JSL34wA6rTi3dY2qHwTAv8H1i9Ub
It will be very tricky to work with so many faces 
Cheers,
Ani
1 Like
Hi Ani,
thanks for the nice job bout it doesn’t work.
SimScale is not able to mesh the surfaces.
Mesh operation failed
The following mesh operation(s) failed:
- Mesh 1
- An internal mesh could not be created as the geometry model consists at least partly of surface data. Please try to solidify these parts.
Please check the ‘Event Log’ and ‘Meshing log’ for more details.
In case of questions, feel free to contact us at support@simscale.com or ask in the Forum.
Hi Jusef,
Ani tried to split the surfaces but the mesh doesnt work already on SimScale.
Tomorrow I’ll send you the STL file if you think it makes sense.
If it always doesn’t work I have to try another CAD software.
Thanks and regards
Andreas
Hi Sir
The problem is your double layered geometry. The mesh solver cannot decide the fluid region and is not able to
make a mesh. if possible then please keep the inner faces only and try to avoid the thickness of the walls(because of which double layered geometry is being formed)
Thanks
Ani
1 Like
Hi Andreas,
Ani is right here. You have to use one layer in order to mesh the geometry properly. Then these weird artifacts and multiple splits that you have seen in Ani’s share before should not occur anymore.
Best,
Jousef
Hello, Jusef,
I’ve finally managed to draw a stp that SimScale is able to split the surfaces.
Next problem: i can not find the external flow domani box.
I saw the tutorial " Applications of CFD & FEA Simulation in the Construction Industry" ant without this box is not possbile to assign the boundary conditions.
Other issue: Incompressible anlysis LBM is locked. What ist the reason?
Best
Andreas
1 Like
Hi andreas
In geometry perspective section you will see the bounding box option which will determine the size of your domain. Change the dimension of the box according to your need and set the material point outside of the house //or// if you are using the automatic meshing process, then just click on the external meshing mode option.
Thanks
Ani
Hi Andreas!
Regarding the LBM solver: This solver is only available for professional users so if there is any interest for a professional license please let me know and I will forward your query.
All the best.
Jousef
Thanks Guys.
Let’s have an other try.
Waht is the diference between backround mesh box an cartesian box.
Size?
Best
Andreas
Hi Andreas!
The background mesh box hex defines the size of the computational domain and a base level mesh density. The cartesian boxes that you can add as geometry primitives can be used for wake refinements for instance so you would define smaller boxes inside the bigger box and can increase the refinement level within those regions.
Cheers,
Jousef
Thanks Jousef.
Actually I’m working on run number 6 and I hope this time i get the data i need.
I want so see the flow lines
Do I need an aditional software for the visualisazion on the results ?
I is possbile to set the time for the transiemt simulation?
