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Toon

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  1. Hi I am performing a heat transfer simulation (steady state). The model consists of 2 plates joined together by a glue connector. One plate is heated up, the other one is at the ambient temperature. The problem I have is that when I look at the result, the RBE3 elements seem to act as insulators (see image below), the bottom surface is hooter that the upper surface, the blue region is the glue. I know it is possible to specify a thermal expansion coefficient for these elements but is it possible to specify a thermal conductivity value as well? Looking forward to your replies Toon
  2. Hi all, I have a question on particle tracing. I want to set up a cfd simulation where an exhaust emits particles. I want to trace these (finite mass) particles and determine the particle concentrations at certain areas. As a bonus it would be nice if I could check the particles which are deposited on a surface near the exhaust. I want to perform the cfd solution with acusolve while the particle tracing will be done with acutrace. Are the predescribed aspects possible within acusolve and acutrace software? Looking forward to your replies Toon
  3. Hi I am doing some test calculations in optistruct. I have a very thin plate with basically no mechanical strength and stiffness, attached to a plate with moderate strength and stiffness. When I heat up both plates I get deformations due to thermal expansion which are expected. Now when I only heat up the very thin plate, the deformations due to thermal expansion are higher compared to the previous case (so also the thick plate now has higher deformations even if it is not thermally expanding). This made me wonder the following: is material stiffness is neglected in a thermal expansion analysis?
  4. Hi all I want to calculate deformations in a solid due to thermal expansion. I calculated the temperature field in a CFD solver and now want to use this temperature field in Optistruct in a thermal expansion analysis. I have used the linear interpolation under BCs>Create>Temperatures but when I ran the simulation no displacements were calculated. I discovered that apparently the linear interpolation tool only works for shell elements (while I have a solid with solid elements obviously) so I think this has something to do with my problem. My question is: How would I import a temperature map to my thermal expansion simulation (with a solid) in Optistruct? Is there another way? Looking forward to your ideas Toon
  5. Hi I am trying to perform a (transient) thermal analysis where a composite plate is subjected to radiation. The plate consists of 2 plies, the one on top is made of glass, the one on the bottom is made of aluminium. The radiation needs to go trough the glass and then reaches the aluminium plate. The aluminium absorbs almost all of the radiation, the glass mainly lets the radiation trough and reflects it. How would I model this? Is it possible to do a thermal simulation like this with hyperworks software, like optistruct or radioss? I already looked at the tutorials but they don't match my case. I also tried acusolve but here it is not possible either because radiation through glass cannot be simulated properly.
  6. Hi I am trying to perform a thermal analysis where a composite plate is subjected to radiation. The plate consists of 2 plies, the one on top is made of glass, the one on the bottom is made of aluminium. The radiation needs to go trough the glass and then reaches the aluminium plate. The aluminium absorbs almost all of the radiation, the glass mainly lets the radiation trough. How would I model this? I already did a test simulation which runs fine but it seems as if all the radiation is absorbed by the glass layer which of course is not what I want to achieve. Either the way I modelled the radiation is wrong or either my radiation coefficients are wrong, these are the ones I used: The radiation properties for glass: emissivity: 0.75 , specular transmissivity: 0.85 , diffuse transmissivity: 0 , specular reflectivity: 0.08 , diffuse reflectivity: 0 The radiation properties for aluminium: emissivity: 0.1 , specular transmissivity: 0 , diffuse transmissivity: 0 , specular reflectivity: 0.5 , diffuse reflectivity: 0.1 Any ideas or remarks?
  7. Hi, I am performing research for a thermal radiation CFD simulation. The simulation is the following: A plate is locally heated by a laserbeam. So my question is: would it be possible to only apply radiation on this single spot? How would I do this in AcuConsole? I have done a greenhouse simulation already with radiation heat but than the radiation hit the complete model. So is it possible to only locally apply radiation in a model? Thank you in advance Toon
  8. Hi I am trying to simulate the temperature of a piece of paper lying on a surface, both subject to a radiation source (so a thermal CFD analyis). I made a large cube where the bottom side is the floor and the upper side is the outlet. The 4 vertical sides are inlets with a very low inflow speed (0.01 m/s). The piece of paper (modelled as a solid with the correct properties of paper) is lying on the floor obviously. Radiation heat is hitting the surface and the paper from dead above. When I try to run the model I get the following error: ''Non-planar inlet boundary condition found <Inlet quad4 Fluid wedge6>'' so I suppose something is up with how I am trying to simulate this problem (multple inlets,...). I ran the exact same problem with only one inlet and it ran fine. The paper and floor got hot but the asymmetry of the inflow kinda ''contaminated'' the result. Any ideas on how I can solve this? I am also wondering is there is a better way of solving this problem (so maybe I should use a different model setup)? I am not really interested in the flow field itself, more about the temperatures and flow field due to the temperatures (I included buoyancy due to Boussinesq). Any help and advice is appreciated! Thanks in advance Toon
  9. Hello, I am doing a CFD analysis and when I try to export my problem into acusolve I get a segmentation error. The segmentation error pops up when hypermesh says ''Extracting Porosity Model''. any help is appreciated. Unfortunately I cannot share the model due to confidentiality. Toon
  10. Hello, I have a problem when I open an additional Hypermesh window. The first window opens normally but when I want to open an additional window It does not open this extra window. I have deleted the setting files as is shown on this forum but the issue remains. I noticed in the task manager of my PC that when I try to open this extra hypermesh window, it opens under the background processes as opposed to under the apps. If I try to do the same thing with hyperview everything works fine and I can work with multiple windows simultaneously. Any advice is greatly appreciated as this issue is very annoying. Toon
  11. Hello, I am simulating an impact of two bars falling to the floor. These bars are initially held together with a RBE2 element while falling down to the floor. I am now trying to delete this connecting RBE2 element right before the bars hit the floor. How do I do this? I am currently experimenting with sensors but I haven't been able to figure it out yet. Thank you Toon
  12. I am trying to simulate the influence of an unbalanced tyre on the structure using an FRF. Because it is rotating in the XZ-plane I have made two inputs, one excitation in X and one in Z. I combine these inputs in a DLOAD through 2 RLOAD load collectors. The thing I am struggling with is implying a 90 degree phase delay for one of the 2 RLOAD collectors. I have expirimented with the delay option and dphase option but I have not obtained the result I wanted. How do I apply this delay in my model? Is there a tutorial for this?
  13. Hi Premanand, Thank you for your reply. I will try the solution you proposed. Additionally, I assume I should also check the acceleration box under the subcase options of the load case, or should I leave it on displacement? Thank you
  14. Hi I am performing a modal frequency response analysis with OptiStruct. The model I have gives the displacement as output. However, I am interested in the acceleration as output. I tried obtaining this by checking the acceleration box under load steps => load case => subcase options output, but I could not access the acceleration result when in hyperview. Am I missing something? I can calculate the acceleration from the displacements but I feel like I should be able to get the acceleration results directly from the model. Thx
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