Hi Wei, Do you have any update on this?
On Thursday, August 11, 2022 at 10:46:33 PM UTC+8 [email protected] wrote: > Hi Trinidad, > > Thanks for the mesh file, but I'm not sure if the quad element is Ok or > not, I'll need to talk to our lab member who is working on the FEA to see > if we can model this problem using the ANCF shell element. > > Radu, > Do you think this is doable using the ANCF 3423 shell element? > > Thank you, > Wei > > On Thu, Aug 11, 2022 at 3:36 AM Trinidad Mcdavids <[email protected]> > wrote: > >> Hi Wei, >> >> The updated obj mesh is attached. The mesh is of quad elements, but not >> rectangle elements. >> >> I am not sure whether this would be OK. >> >> On Thursday, August 11, 2022 at 1:30:52 AM UTC+8 [email protected] wrote: >> >>> Can you please convert the mesh file to OBJ format so we can take a >>> look. Keep in mind that we only support mesh with rectangle elements now. >>> Otherwise, it probably will take a while to get this case built correctly. >>> >>> Thank you, >>> Wei >>> >>> On Wed, Aug 10, 2022 at 10:49 AM Trinidad Mcdavids <[email protected]> >>> wrote: >>> >>>> file now attached. three format provided. >>>> >>>> On Wednesday, August 10, 2022 at 11:19:58 PM UTC+8 Trinidad Mcdavids >>>> wrote: >>>> >>>>> Hi Wei, >>>>> >>>>> I tried to get myself familiar on the vector structure, but it seems a >>>>> bit challenging. >>>>> >>>>> Do you have existing functions that can extract the required >>>>> elements/nodes vector from existing mesh files? I attached a nastran BDF >>>>> file, if needed, i can also convert it to gmsh .msh file or abaqus .inp >>>>> file. >>>>> >>>>> Thanks & Regards, >>>>> Trinidad >>>>> >>>>> On Wednesday, August 10, 2022 at 10:04:11 PM UTC+8 [email protected] >>>>> wrote: >>>>> >>>>>> 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/f4574bc1-e0bd-4490-9c3e-a6b10fe88274n%40googlegroups.com >>>> >>>> <https://groups.google.com/d/msgid/projectchrono/f4574bc1-e0bd-4490-9c3e-a6b10fe88274n%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/e481ea96-26d8-4252-a196-abde4a4c6da7n%40googlegroups.com >> >> <https://groups.google.com/d/msgid/projectchrono/e481ea96-26d8-4252-a196-abde4a4c6da7n%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> > -- You received this message because you are subscribed to the Google Groups "ProjectChrono" group. 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