Hi Trinidad, Yes, if you can generate a mesh file based on the FSI requirement, I think it's doable. You can drop your updated mesh file and new code here, so we can take a look at it, and probably can do a test for you at our end.
For post-processing, we can extract the stress and deformation of the flexible body and also the pressure/velocity field of the fluid. Thank you, Wei On Wed, Aug 10, 2022 at 12:26 AM Trinidad Mcdavids <[email protected]> wrote: > Dear Wei, > > Since my case is a bit urgent, I would like to try the manual method of > generating the mesh. Do you think it is feasible? > > I can generate quad shell mesh using gmsh, do you think it is possible to > export to the manual mesh vector? I can write a small function to do this, > e.g read gmsh .msh file and export the vectors. > > Finally, how about the post-processing? do you think it is possible to > extract the flexible body stress & deformation to vtk file? how about fluid > contour map? > > On Wednesday, August 10, 2022 at 12:01:50 PM UTC+8 [email protected] > wrote: > >> Hi Trinidad, >> >> In the current implementation of Chrono::FSI, we have very limited >> support for interaction with flexible bodies. We only support flexible >> bodies described with the ANCF cable element or ANCF shell element. >> Unfortunately, we can not read directly from a mesh file. You should >> manually input those elements and nodes to a mesh. The ANCF shell elements >> should also be rectangular elements which I believe it's not the case with >> the mesh you import from an OBJ file. Another important thing you need to >> take care of is related to *NodeNeighborElement_mesh* and * >> _2D_elementsNodes_mesh*. The two vectors contain important information >> that is needed for the simulation and should be initialized with the >> correct value. You can take a look at that flexible element demo and see >> how these two vectors are initialized therein. >> >> We haven't maintained the flexible bodies support in FSI for about three >> years, so it probably takes a while to modify the code and make it works >> for your case. However, *the good news is*, we restarted the maintenance >> of this feature two weeks ago. The ongoing work in the next couple of >> months is to make it available to directly read a mesh from an OBJ file and >> generate BCE automatically, which I believe is exactly the feature you want >> to use in your demo, so the user can use this code much easier. We'll make >> it as fast as possible, please stay tuned with the *main* branch of Chrono. >> >> Thank you, >> Wei >> >> On Tue, Aug 9, 2022 at 10:00 PM Trinidad Mcdavids <[email protected]> >> wrote: >> >>> Hello, >>> >>> I am trying to simulate a case of flexible ball impacting water surface >>> (similar to the case cylinderDrop, the difference is the cylinder is >>> elastic install regid). The ball mesh was imported from obj file instead of >>> generated manually. >>> >>> 1. I made an example case out of "fsi_felxbile element" & >>> "fsi_cylinderdrop", but is a bit lost regarding the BCE setting? how can >>> the BCE be applied for the imported fem mesh? >>> >>> 2. The examples case i made is attached. It seems the case can not be >>> compiled with many errors. Could you please kindly help to quick check what >>> is wrong in my codes? >>> >>> 3. Regarding the post processing, i would like to show the deformation & >>> stress of the elastic body as well as the pressure/velocity contour map of >>> the fluid to be exported to vtk file. how can this be done? >>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "ProjectChrono" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> To view this discussion on the web visit >>> https://groups.google.com/d/msgid/projectchrono/d7917585-9dd6-4989-9878-dd86fb95d425n%40googlegroups.com >>> <https://groups.google.com/d/msgid/projectchrono/d7917585-9dd6-4989-9878-dd86fb95d425n%40googlegroups.com?utm_medium=email&utm_source=footer> >>> . >>> >> -- > You received this message because you are subscribed to the Google Groups > "ProjectChrono" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/projectchrono/aa66fa4f-5911-4e2b-8ccb-a16200735e89n%40googlegroups.com > <https://groups.google.com/d/msgid/projectchrono/aa66fa4f-5911-4e2b-8ccb-a16200735e89n%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "ProjectChrono" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/projectchrono/CAMbtuy5Q69%3DWO6kyzvLM3MkT3Rb7WMgop-nkA76%2Bt4wFweW9HQ%40mail.gmail.com.
