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Found 37 results

  1. Hey, I have the following issue during meshing my 2D airfoil with an obtuse trailing edge: I would like to mesh my airfoil like that: BL-Mesh with quad elements from leading edge to trailing edge (upper and lower part of airfoil) and the vertical area at the trailing edge (photo: yellow 1D elements) with tria elements (therefore farfield instead of wall) in order to avoid the quad mesh around the trailing edge (see photo with red quad BL elements). However, when doing this with the Tool "2D Native BL Mesh Planar" it says "selected elements do not form closed loop" (see photo). Therefore I would like to ask, if there is a possibility to avoid quad elements at a certrain part around the airfoil with the Tool 2D Native BL Mesh (Planar)... Or is there a possibility to delete the quad elements around the trailing edge and remesh this area? Thank you very much in advance for your help! Cheers, Martin
  2. Ducret

    Mesh with nodes

    Hi, I am a beginner pon hypermesh and i have a question, how can i mesh using nodes i have already place? I send a picture for a better understanding. Then i do not remember how can i put thicknesses on midsurface? THanks you in advance 2018-05-13_13-08-01.pdf
  3. Phil Noop

    Enclosing mesh for CFD

    Hello everyone, I picked up Hypermesh only a couple of days ago, so I still have a fair amount of trouble. My goal is to create a CFD Tetra mesh for a wing. The problem is that I cannot enclose the mesh of the symmetry surface around my wing root. There is always a small fraction that stays open. I trimmed the symmetry surface using the lines of the wing root and then deleted the resulting surface. I know that I can find the free edges and then get equivalance to solve my problem, but it only distorts my entire mesh. I would be very thankful for any kind of advice on how to solve this problem. wing_perf3edges.hm
  4. Hello, I have been trying to understand and adapt the Radioss Thermal Example (RD-5300), in order to make it represent the stress relief procedure. Alternatively, as the time of operation is relatively short, one might think of it as a welding process, with a lot of heat input into the material and generating large temperature gradients. I have been using HW2017.2. The assumptions are as follows: 1. The "weld" along a square trajectory is subject to a high thermal load from the "Source". 2. The "Source" has a constant temperature of 1300 K, and transfers heat through Inter/Type7 to the plate. The coefficient of exchange is high (1000 units), in order to provide a lot of heat in limited time. 3. The heat transfer is based on the actual temperatures of both components (i.e. Ithe=1). 4. The convection heat transfer coefficient is arbitrarily chosen as 1.0, and the ambient temperature is set to 298 K. 5. The initial temperature of the plate is 298 K, i.e. it is the room temperature. Now, the results are puzzling. I particular, I obtain some negative temperatures on the contour plot, and there are temperature "waves"/"oscillations" on the model. I suppose it is associated with the thermal stability conditions and the mesh sizing, but - RADIOSS does not generate any warning - I guess the Help system has some gaps in the relevant topic, and I am not able to figure out how to correct the model. In particular, /DT/THERM, according to the Help page seems to require no parameters, whereas I suppose it should work like /DT or /DT/NODA. I find as well the /THERMAL topic very limited, and I do not know how to properly use the time scaling for thermal material data - In particular, I do not now to interpret the time stability limit. Should the time chosen be smaller than the one calculated from the formula, or rather larger? - In the help system, I could not find hints on correct meshing for a thermal transient problem - I was not able to find a means of making Radioss (or HyperMesh, or HyperView) estimate and present the local values of thermal stable time step, and the time step chosen for the simulation seems to be derivced from the standard "mechanical" Courant condition. Artificial reduction by /DTIX did not help in this case. Please shed some light on the topic Regards and thanks in advance Marek Augustyniak Poland Alu_Stress_Relief.zip
  5. Hello Everyone, i am having a problem with Hyperworks version 2017.2. I have an already meshed model.When i delete a mesh on one surface and then mesh that surface again, the new elements don't attach to the ones on the adjasent surface, although both surfaces are attached to each other. Does anyone know how to solve this probelm, without having to remesh the model? Also when remeshing a surface without deleting the mesh on it before, the new mesh just sits above the old one as if it were not there... So i get 2 meshes above each other. Can someone please help? Thank you!
  6. Hello, I would like to tetra mesh my component from a 2D mesh of trias that already exists. The 2D mesh must remain constant as it has a load applied to it that cannot be changed. The problem I am having is that the tetra mesh option 'fixed trias to tetra mesh' produces large size elements in the middle of the model. I would like to constrain the maximum size of the 3D tetra mesh so its does not increase in size in this way. Is this possible? Thank you in advance
  7. First of all, sorry if I added this question not according to the official Terms of use. It´s my first question... The problem itself is quite easy to solve i quess. I want to create a 2D mesh that is more coarse in one direction than in the other. In my case I want to have only 3 sections in the y-direction and very fine sections in x-direction. I created the geometry by first connecting 2 nodes with a linear line. Then I created a Surface by dragging along a vector. The mesh was then created by AutoMesh. Thanks in adcvance! Cheers
  8. Marx

    Hypermesh

    Hey, Can someone suggest me the best meshing technique and method to analyse the rollcage. Is 2d mesh enough or 3d mesh required for accurate results?
  9. Hi, why we do second order tetra mesh? and why not we prefer first order tet mesh? what is the difference between these two? Anyone please explain it in detail... thanks.
  10. matej

    Integration points

    Hello, for a certain element type in Hypermesh I am able to switch between 1st and 2nd order. Is it possible to set also reduced integration for a chosen element, or to prescribe the location of the integration points? Thanks for all information, Matej
  11. I have meshed my wing and when I run the simulations for RCS I get the following error: ''ERROR 240: A triangle is too small or EPSENT is too large'' It worked for me when I had half wing but when I use full wing by mirroring it gives me error. I also tried making Union between components but still gives me error... You can find my model attached herewith. Looking forward to some helpful advice. Thank you! Try.cfx
  12. Tom Foster

    AcuMeshSim

    Running from AcuConsole, AcuMeshSim generates the following message in Error Window: Traceback (most recent call last): File "pnlWin.py", line 944, in funcTool File "pnlTools.py", line 244, in toolGenMesh File "pnlToolsAcuMeshSim.py", line 120, in __init__ File "pnlToolsAcuMeshSim.py", line 463, in genMesh File "pnlToolsAcuMeshSim.py", line 576, in exportAmsFile File "pnlAmsExport.py", line 120, in exportFile File "GlobalMeshAttributes.py", line 244, in cmdOutGlobalMeshAttributes File "pnlScope.py", line 775, in <lambda> File "pnlAmsExport.py", line 719, in outWriteCadInfo pnlAmsExportError: 'Error from ams export module: <Unable to retrieve cad data> ' In the working folder, __cad_dir.zip is created instead if a CAD.DIR folder containing the Parasolid file that AcuMeshSim requires. The __cad_dir.zip is not a readable .zip file. No mesh is generated for the model data base. I haven't found the python script file "pnlAmsExport.py" to see what it's doing.
  13. Shivang

    Checking Elements

    Checking elements after meshing gives some percentage of element failed then how much percentage is acceptable.
  14. HemantD

    Convergence

    How do I know the convergence of mesh size in my model? Is there a method to know if the mesh has converged?
  15. Muge Candogan

    Solid Mapping issue

    Hello, I am trying to 3D mesh this solid part by using solid mapping. I tried "trim with surf" to make the part mappable but I don't think I can create surfaces/divisions good enough for solid mapping.I am also attaching the partially trimmed version. Which method I should follow to make the rectangular sides mappable and get rid of the red layer in the cylindrical part? Thank you in advance, Muge
  16. I have a full vehicle with Body, Chassis, Suspension, Axle, Cabin, Floor, Roof, Glass, Windshield, Tyre, etc.. in actual manner as in complete assembly. 2D components are present. Now I want to create 3D in a single component for all the 2D components for my analysis. I don't have enough time to mesh all components in 3D & connect. I want to transform the 2D comp to 3D, the may be I can connect all the solids together into 1 component. Please suggest an option. Is there any Batchmesh available or may be tcl script? The Sample 3D model pic is shared for reference. I want the same thing.
  17. Prudhomme Jules

    Decrease diameter of cylindrical die

    Hi; I'm working on Hypermesh V13.0 and I have to mesh a cylindrical die oncoming from Solidworks ( Save as .STEP AP203). On Hypermesh I want to decrease the external diameter of the die for exemple I want to mesh the die with this different diameter : Ø40 / Ø35 / Ø30 / Ø25. This operation is possible with Solidworks but it's very long lasting because I have to mesh 14 die with four different Ø (--> 56 similary meshing). And for my simulation is better if I have the same meshing on every diameter. My approach for this is : 1st : I import geometry which is step file type : For beginning I import a die Ø40. 2nd : In "GEOM" tool menu I use quick edit for decrease my Ø; for this I use the washer split with an offset value : 2.5 (to have 5mm on the Ø). After I supress the older lines with toggle edge (the older lines are on dotted line). --> And now I fail to mesh my new geometry (with F12 tool menu) When I use (size and bias) : Surf --> Display --> Mesh : The older lines (dotted) are meshing. --> Surf --> By Window --> I select the lines which I want meshing --> The older lines aren't meshing () but I don't have mesh on the new external surface of the die as the die is hollow. --> OK // --> External surface NOK I think my approach for decrease the external diameter isn't good. I think I have to create a new surface but I just create news lines. For your information I don't have the center of my die in hypermesh I hope you understand my problem and you can help me. Jules PRUDHOMME.
  18. Tuan Nguyen

    Meshing in EDITFEKO

    Hi, I have a simple problem. I create a closed cylinder in Cadfeko, union and mesh it. However, when I try it in Editfeko, I create two ellipses and a cylinder and mesh it. The number of triangles in are close ( 2158 vs 2352 ) but the number of points are different (1000 vs 7000). I took the nas output file to draw the mesh and attached in the files below. Since the number of points in Editfeko is too big, I think there is a problem with it, maybe relating to the union. Can anyone explain to me this phenomenon ? editfeko.fig cadfeko.fig
  19. Hi, I am wondering how to add a local mesh to a port. I can add a local mesh to a dipole but the mesh is not added to the port connected to dipole. How can I overcome this? Thanks in advanced
  20. Dear Admin, I would like to ask your kind advice regarding meshing. I have a 3d voxel meshed file. The voxels are defined as solid sections. Now, all I want is to remove the voxels which are not sharing at least a common face. So, if any voxel that is not sharing a face with another voxel but sharing an edge or a corner, needs to be deleted. I want this to be done for all the existing voxel elements with one single procedure and not one by one. How can I do this. Thanks in advance.
  21. Hi, I am trying to simulate a thermal ablation, where the antenna and tissue is touching each other. I am getting ERROR 3848: Wrong specification of the medium for a wire segment. However, when I set up the antenna and tissue apart I am not getting the error. As I understand this error occurs when meshing 2 touching objects with different materials. I am not sure how to fix it. Any help is much appreciated Thanks
  22. Abhishek Kumar

    Shell element

    Hiii. I wanted to use 8 noded shell element in my analysis...which element in hypermesh is 8 noded shell element?
  23. Abhishek Kumar

    mesh quality

    dear all, I am trying to simulate tensile test in hyperworks. For meshing I am using 2D element because it is a tensile specimen made of sheet. I am very much concerned about quality of mesh, because when i am using automesh command it generates very irregular mesh. I have seen many papers in which meshing is very fine in critical area and the quality of mesh is also good (transition of mesh). Geometry of specimen is complex because im using modified specimen for simulating shear fracture. Can anyone suggest me that how I can improve mesh quality near the center of the specimen and i also want to fine meshing near center. I have read about mesh transition but I don't know how to do it in my case. I have attached the image of mesh used by others and also mesh generated by auto mesh in my case. I have taken mesh size 1. please, help me.
  24. Hi, I am trying to mesh a cylinder with internal profile. I have created a design space and non design space separately in solidworks. I joined them into a new part and imported it into hypermesh. I am able to select design and non-design spaces very easily. The problem is with meshing. I think there are duplicate surfaces and free edges which created. So I have been trying this since long and it is giving meshing errors. When I do tetrameshing, a temp 2d element component is created. I tried equivalence, removing free edges and T connections. Still not able to resolve. I wanted to try deleting duplicate syrfaces, but it gives an error saying surfaces attached to solids cannot be deleted. Is there any way to mesh this model. I have attached the .hm file here THanks in advance. help_altair.zip
  25. SHARAN@123456789

    ELEMENT OFFSET

    Hi .. element off set option works better when we know the thickness yes I agree .. but when we have huge distortion surfaces when we extrct mid from plastic component and we are unable to mesh at outer surface . . can I get more information about off set of The elments when component is made of plastic and it having three to four dog house in the plane Thanks
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