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Found 36 results

1. ## friction and heat

Hi All, is there a way to perform a thermo-structural analysis of two bodies in contact, in which the energy related to the contact tangent force is converted to heat? I want to obtain the temperature map in a brake, given the geometry, the material properties and the contact force. Thanks, Enrico
2. ## Heat Transfer between 2 solids with OptiStruct

Hi, I am new doing heat transfer analysis with OptiStruct, and I need to solve the following problem: 2 coaxial cylinders (see image below) The inner Surface of the external cylinder (blue) is generating a heat flux, which makes to increase the internal cylinder temperature (by convection). I need to know the temperature of the small cylinder (yellow) and I don´t know how to proceed to solve this kind of problems. What are the guidelines to solve this problem? Thanks in advance!
3. ## Bertotti Losses distribution in Flux2D Thermal simulation

Hello, I am performing thermal simulation using Flux2D and I want to import Bertotti losses distribution from magnetostatic model using Python script. When I run the .py script I receive the following error: Unknown argument: Bertotti_losses_distribution_stator_lamination_2D This argument must be defined in your jython session before usage. Do you have any idea about that? Could you help me, please? Thanks.
4. ## Thermal simulation in Flux2D - Execution failed

Hi, I am performing a thermal simulation of PMSM using Flux2D but when I start solving the execution fails after a few seconds and the following error appears: PBCEVL_3 => Failed PBERES_3 => failed FL5RE4 => Command not executed correctly FL5ERS => failed FL5ERS_1 => failed executeAlgo => failed executeAlgo : Execution failed. PBCEVL_4 => failed PBCEVL_3 => FailedFL5RE4 => Command not executed correctly executeAlgo : Execution failed. PBCEVL_4 => failed PBCEVL_3 => FailedFL5RE4 => Command not executed correctly Do you have any idea what might be a problem? Thanks.
5. ## Coincident Nodes between two solids for thermal simulation with AcuSolve

Hello, I want to make a thermal simulation of a cooling plate in hyperworks with the AcuSolve Solver. The geometry would be this: Where an aluminium cooling plate (the grey solid) is in contact with a water flow (blue volume). The problem is that I can't get a mesh with coincident nodes between both volumes, taking into acount that for the AcuSolve simulation I need two surfaces in the interface between the solid and the liquid volume. Do you have any solution for it? Thanks in advance.
6. ## Solver not correctly converged.

Hi, I did induction heating simulation in Flux2D . I try to define my substrates from isotropic to anisotropic on resisitivity - which means the Y-direction value become much smaller. Then I hit the solver but it says the it is not correctly converge. What can I changed to make it happen? Best, Jerome.
7. ## Contact Thermal

Dear All, I try to do simple heat transfer simulation by following OS-1385. when I run the simulation I got Error 1000 message, I know that the CGAP material does not have material, but in the OS-1385, the CGAP also doesn't have material too. Please your advise. Best regards, Iron_man CASE01.fem
8. ## Thermal expansion material stiffness

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?

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.
10. ## Thermal Analysis

Hello, I am trying to figure out how to model the heat generation on a brake rotor during braking using Optistruct. Are there any guides that describe this process or something similar to this? How would you approach this? The total energy of the system is known and will be evenly distributed over three brake rotors to stop the vehicle in a given time. Now, I need to model the maximum temperature reached.
11. ## Linear Static Analysis with Thermal Boundary Conditions

Hello, I am working on a project to simulate the cooling phase in an enamelling process. I simply generated a composite cantilever beam with two different materials to obtain the stresses and displacements during cooling process. I will cool down the composite cantilever beam from an elevated temperature to room temperature. The problem is, I am new to thermal boundary conditions and I can't find the correct load collector combination to handle the problem. To summarize the simulation; 1. Structure is at 350 degrees celcius and it will cool down to 20 degrees celcius. 2. Due to thermal expansion coefficent difference, the composite beam will deform. Thanks in advance! Mert Cevdet Gunay
12. ## RADIATION and time scaling

Hello, i have a little question about the possibility of time scaling and the use of the radiation load collector. I used the factor 10 (1sec in simulation=10sec in real time) to speed up my thermal analysis with radioss. It works fine wenn i scale thermal conductivity and the heat transfer coefficent (for example convection) by the factor i used for speed up (10). Is this although possible for the radiation? Because i don't see any way to scale this value in correct way... With best regards Kintsch
13. ## Thermal mapping/analysis in ventilated motorcycle helmet

Hello guys, I am undergoing master in university right now and my title of my research is "OPTIMISING THE COMFORT IN MOTORCYCLE HELMET BY THERMAL/MOISTURE MAPPING". It is all about the effect of temperature inside the motorcycle helmet during riding a bike. Therefore, it is related to CFD which will effect the thermal energy inside/outside the helmet. The question is, how should I approach this type of case study using HyperWorks? I would be great if you guys attach some of tutorials. - example of vented motorcycle helmet image attached () plus I tried this tutorial (http://training.altairuniversity.com/analysis/thermal/projects/thermal-analysis-heat-transfer/) using HyperWorks version 13 but I stuck with assigning "Conductivity" Tutorials () Mine () Thanks. Mixi
14. ## conduction heat transfer of a rod

i want to do thermal conduction analysis of a rod. length = 100 mm , radius = 10 mm . temperature on one side is 250 degree & 150 on other side. k = 230 w/mk. how to apply temperature & boundary conditions to the body. i want to find out temperature variation.
15. ## Thermal Optimization

Has anybody applied temperature to an optimization? Does this affect the optimization in any way, or are you supposed to just use it to see a temperature profile when you analyze a structurally optimized part?
16. ## Little doubt with Thermal/Estruture Analysis.

Hello! I'm triyng to do a thermal/estructure analysis. I Would to know how the program works with the changing on Young's Modulus, because of the increase of temperature on material. By tutorials, I set up MAT 1 and turn on MAT 4, to thermal properties. But, don't have any relation between the shape of Young's modulus and temperature. Thanks in advance!
17. ## Minimizing internal strain energy

I know how to define an output block to get the internal strain energy per unit volume within HyperWorks, and how to define custom objective function equations using the dequation button, but can't seem to call the internal strain energy, since I can't figure out how to define it as a response in HyperMesh. Is this feature supported in HyperMesh?
18. ## Solving - Thermal Case study - Double Layers

Hi All Trying to run an Optistruct analysis to see how two layers of different materials will displace when experiencing a thermal load. In my case I have chosen points along a lattic where the temperature would be 80degC. But when running my model in Optistruct and in trying to view the results, the model cannot show a viable solution or a solution that makes sense, in fact, I have not setup the pre processing properly (it seems) which has lead to a model with massive deformation. Also I am unable to view the contours. The attached picture shows circled areas (red) where I have made equivalence nodes, there is an expected connection at these points (not defined). Hoping that anyone could give advice or guidance! Phil Busbar Copper Lattice Model 2D.fem Busbar Copper Lattice Model 2D.mvw
19. ## how to check effect to temp on deformation and contact pressure in an object

Dear All, I'm using HM as a pre-processor and optistuct as a solver. want to simulate following condition shaft of size =10.000 mm and housing = 9.999 mm(interference of 1 micron) when i'm trying to rotate shaft using motor by keeping fixed housing. 150 degree temp is generated. want to observe the effect of temp on contact pressure and deformation of housing ID and Shaft OD. model is setup is done as per NLQS. what extra i need to incorporate to observe above effect regards, Ganesh
20. ## Delayed Convection

Hi All, I have a question involving the HyperMesh preprocessor. I'm trying to run a transient thermal analysis, where there is a consistent base boundary condition, and convection is applied, but only after a delay. I'm having a hard time figuring out how to apply convection partway through the analysis. For example, I'm allowing the part to heat for 25 seconds, and then turning a fan on and blowing on it for the last 25. I have my TLOAD1, TABLED1, SPCD, and SPC collectors for convection, but I can't figure out how to apply this delay. I tried setting the TABLED1 value to 0 for the first 25 seconds, but that just sets temperature to zero I believe. I imagine the DELAY_OPTION would be helpful, but I don't know how. Thanks very much for any help you can provide.
21. ## Thermal response of large CCD camera with cryostat

Submitted by Anders89 on Tue, 05/04/2010 - 03:23 I wanted to pass along the results of my work with simulating the thermal system for a large CCD camera we are building - this is a dynamic model of the heat flow using cascaded elements, in effect a 1 dimensional slice through the camera assuming it is symmetric about the center (not strictly true, but good enough for the model). Surprisingly, the real data agrees with the model quite well, to ~10% - much better than I'd hoped given the approximations. The differences are probably unmodeled radiative effects in the internal elements - its hard to know the real surface emissivities, and there isn't really a lot of good data on material characteristics at these temperatures. I attach the model and a spreadsheet that contains data and renderings of the camera. The cooling is provided by 2-stage variable-speed helium cryo-pumps, I've put in curves for 2 speeds, might get around to doing an interpolation table to look at controlling the temperature by varying the pump speed but that isn't the operating plan at the moment. Hope this is interesting/useful... Mark F. Waterson Sr. Detector Engineer Mount Stromlo Observatory Research School of Astrophysics and Astronomy Australian National University Cotter Rd Weston, ACT 2611 Australia Skymapper Camera temperature flow.vsm
22. ## composites Thermal residual Strain of composites

Hi Everybody, I am trying to simulate the residual strain on different ply's of a laminate due to different rates of cooldown. I was planning to do this with a heat transfer analysis (transient) but I believe that composites are not supported in transient heat transfer. Is it possible to perform a sort of transient analysis applying a Delt Tº in the different time frame? I was thinking to do this with TLOAD1 with excited a TEMPD and a Table1 Is this approach correct? Thank you beforehand
23. ## Thermal Analysis

How can I perform a thermal analysis of a brake disc in Hyperworks? Guide me through some tutorial if possible.
24. ## Using HyperMesh for simple thermal simulation using Abaqus solver?

Hello, I have a plastic part subjected to heated air and I want to simulate the thermal expansion (no CFD required, just a simplified thermal expansion with temperature inputs is sufficient). I am using HyperMesh for pre and post processing and my solver is Abaqus. I have no idea how to do this, already tried the Joule heating solver, static solver, explicit solver, etc always get some errors which has no meaning intuitively. Can anybody tell me how to go ahead with this? If there is a tutorial or a pdf on this topic what would be very helpful.
25. ## Thermal BCs

Hello everyone Can someone give me an advice on how to indicate that a certain surface have a temperature of 20°C and another surface of 80°C? And also indicate the pressure of those surfaces? In order to get thermal and mechanical results of it? I thank you in advance for your help!
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