Adam 0 Report post Posted March 7, 2025 Hi, I am currently modelling a turbofan blade passage for optimisation and use in STAR-CCM+. When I export as a step file it appears as an assembly in STAR-CCM+ and I cannot replace the part for the optimisation automation. I believe it to be an error in my modelling. I have made separate surfaces (e.g. Inlet, Outlet, Blade surface etc.) but am not sure if they have been connected properly to be used as a singular part ready to be exported as the Domain into STAR-CCM+. Any help with uniting the surfaces would be greatly appreciated. Kind regards Adam FAN3.cdbc Share this post Link to post Share on other sites
Mr. Heinrich von Zadow 12 Report post Posted March 11, 2025 Hi Adam, take a look at BReps -- they are the way to go when combining, uniting, substracting, etc. various parts of your geometry. For boudary conditions you can make use of colors (their names) which can be applied robustly even when topologiacal changes occur in the model during shape variation. You should be able to find everything to get started within the help menu of CAESES. Cheers, Heinrich 1 Share this post Link to post Share on other sites
Adam 0 Report post Posted March 12, 2025 Thank you Heinrich, I have tried what you have suggested and works except for one of the surfaces in my geometry. The blade I have modelled was done using Meta Surface, and this seems to be causing me the majority of issues even when using a Brep or solid from intersection. I have exported the blade on it's own into STAR CCM+ and still shows as an assembly even though there is only a singular part. Is there anything else I could try? Cheers, Adam Share this post Link to post Share on other sites
Mr. Heinrich von Zadow 12 Report post Posted March 12, 2025 Hi Adam, what export format are you using? Can you share the updated project with the BRep you export (you know that you need to select the specific object you are exporting, right?)? Cheers, Heinrich Share this post Link to post Share on other sites
Adam 0 Report post Posted March 13, 2025 Hi Heinrich, I am using the STEP (STAR-CCM+) export option, and yes I have tried highlighting the final subscope which only included the object I wanted. in the project I have made a final subscope named: '05_Final Domain' in which I created a Brep which included all parts of my model from other subscopes into one part. (I believe this is the right method, correct me if I am wrong) Cheers Adam FAN4.cdbc Share this post Link to post Share on other sites
Mr. Heinrich von Zadow 12 Report post Posted March 14, 2025 Hi Adam, that looks promising already. When combining everything, you need to distinguish between boolean operations and simply adding sources. I went through your model and corrected a few things -- mostly adding the domain faces one-by-one using individual "add sources" operations. While doing so, I colored each operation so that your inlet/outlet/periodics, etc are colored reliably. I did the same for the blade and extruded and closed it to obtain a closed solid (you don't want any open/red edges and your final BRep should be closed > you can tell it is closed from it's icon being filled with grey color). Then there is only one boolean operation: substracting the closed blade from the closed domain. Since the blade and tip are already colored, the colors will "imprint" onto your domain during that operation. Hope this helps. Cheers, Heinrich FAN4_HvZ.cdbc 1 Share this post Link to post Share on other sites
Adam 0 Report post Posted March 14, 2025 This is perfect, thank you Heinrich! You have been great help Cheers Adam Share this post Link to post Share on other sites
