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Found 14 results

  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. 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
  3. Hello, excuse me for interrupting. I am doing a simple Steady State Heat Transfer problem with the aim of undestanding how HyperMesh/OptiStruct Works with heat fluxes. My case is a cube on which there are 3 fluxes applied on 3 different faces (red faces in the photo) and there are 2 faces for the convection (cian faces). I am trying to verify if introduced heat is the same as evacuated heat. I know the applied power and I am looking for the way to obtain the evacuated fluxes, normal to the convection faces. Perhaps exists a card for this purpose, but I don't find it. I know that, if I plot the "elemente fluxes" I can obtain the flux of an element in the three directions, (X,Y,Z), but this flux is proper to the control volumen, no to the normal face of evacuation.To sum up, I want to know if there is an option to know the evacuated heat in a Steady State Heat Transfer problem, the flux normal to the convection Surface. Greetings, DavidSol.
  4. How to provide heat transfer between two blocks seperated by some gap .... I have tried TCID and KOHTC entries in PCONTHT Property. My main concern is to find out heat transfer amount between gap (between two blocks ) .... Should not use mesh or gap elements in that gap .... Finally I got some results ... Same way I have tried with various gaps but results are not changed with respect to various gaps.
  5. Hi, Is that possible to couple heat transfer (transient) analysis and direct dynamic analysis? I tried to execute the same procedure indicated in OS-1080: Couple Linear Heat Transfer/ Structure Analysis, but it doesn't work, due to an unsupported subcase (I wrote "TEMP=1" for the SUBCASE_UNSUPPORTED like in the tutorial). Thank you for your help.
  6. Hello everyone, I want to simulate heat pipes used in pcbs for heat transfer. But I have no idea whether this feature of condensation and evaporation is available in acusolve or not. Please help. regards, Tutulika
  7. Hi everyone, I am trying to perform thermal simulation with heat source and sink as boundary condition. I have a positive heat flux(as QVOL acting on solid elements) and a negative heat flux (as QBDY1 acting on conduction interface). However most of the time I could see that the simulation does not converge and the Temperature results are very big. Attached here I have 2 fem files with exactly the same geometry and boundary condition and element size, but different meshing directions. the 1.fem file yields correct results while 2.fem doesn not converge. I have tried to experiment with changing element normal and changing material direction all to be along heat transfer direction but still 2.fem file does not converge and I cant find what makes the difference in simulation results. can anybody check to see if you can converge the 2.fem file ? and what makes 2.fem file not converge? thanks and looking forward to hear from you Rafezi 2.fem 1.fem
  8. Hello all, I am doing CFD analysis of an electronic cabinet having 2 radial fans. Meshing is successfully done. But when I am trying to refine my volume mesh following error is being displayed " could not parse file". I have done surface meshing in hypermesh. For volume meshing in acusolve I have taken mesh size as relative with value of 0.125 . Now when I am trying to refine only air volume mesh with again relative mesh size of 0.008 it is giving error in generating mesh. Please help.
  9. Hello, I am trying to perform a transient heat transfer along a rectangular profile of 100mm. I need Initial conditions to be a temperature profile and not a specific temperature. The temperature profile is in form of an equation: T= Te+(Tl-Te)*exp(-m*x). Te=ambient temp Tl and m= some finite value. T=f(x) along the profile. I have run a matlab code in which I have obtained the values of temperature. Could you please help me input the values of temperature and then run a transient heat transfer analysis. Thanks in advance!!!!
  10. hello all, Warm greetings. I am stuck up with the problem combining both the use of a blower and radiation enclosure together. I have studied fan component tutorial and radiation enclosure tutorial separately . But when I tried to use both within a analysis it is giving "Run time error" message. Please suggest the possible solution. Regards, Tutulika
  11. Hello, I am analysing coolant flow in a cold plate. I have created 3 volumes namely 1. Fluid volume 2. Volume for cold plate so that in acusolve I will assign it a material 3. Heat source I have applied boundary condition and applied material to volume 2 and fluid properties to volume 1. but I am getting error in final processing. please refer the attachment for the error file and the cold plate design for reference(blue colour is heat source)
  12. Heat Transfer into the fluid domain is positive - when referring to OSI Heat Flux or ORI Heat Flux. However, heat transfer into the domain for OSI Convective Temperature Flux is negative - because of the U dot N term in the integral. (See the chart in the acuTrans section of the Programs Reference Manual.) The total heat flux across a surface is the sum of OSI Convective Temperature Flux, OSI Heat Flux, radiation surface heat flux, solar radiation surface heat flux. In order to perform an energy balance across a control volume, all of these components must be summed. It is not possible to break out conduction and convection portions of the heat flux. (Note that Convective Temperature Flux is not the convection heat transfer at the wall - in fact the Convective Temperature Flux should be nearly zero at the wall - because it is due to the flow - and there should be zero flow at the wall.) When you sum the various types of heat flux for all of the bounding surfaces, the sum should be nearly zero - depending on convergence.
  13. Dear Colleagues, I have a problem with heat transfer analysis. I am experienced with ANSYS thermal analyses and at the same time I am working with HyperWorks for a couple of years but it is my first more complex thermal problem that I am solving with HW. My problem is, I don’t know how to set properly the analysis Load collectors and steps. What I want to do: I have a part of a machine (rotating lathe table) which is heated by heat generated in bearings and motor. According to the norms I have performed on machine test and I need to reply this with FEA to obtain a model on which I can test construction changes. The machine has been working in a few timesteps, with different parameters. My question is how to set the Loadsteps to obtain a few substeps which are performed one after the other under the terms of the previous. Bellow I posted a shorten table of the experiment. The heat flux has been calculated analytically. Time [min.] heat flux [W/mm2] 0 – 30 hf1 30 – 60 hf2 60 – 120 hf3 ... After that I want to obtain the temperature distribution on the table and its deformation (displacements).
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