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Found 16 results

  1. Hi, I am doing a heat transfer analysis (transient) with OptiStruct and I want to apply a distribution of temperatures to a solid face. I usually use TLOAD1 cards as DLOAD in the loadstep, and SPCD in the EXCITEID field of the TLOAD card. I know how to apply SPCD constraints when the temperature is the same for all nodes of the face, but I have a .txt file with different temperature values of each node and I don't know how to proceed. What is the procedure to solve this problem? Thanks in advance!
  2. Good afternoon, I have a BEAM (CBEAM) component and I would like to see how it deforms due to a VARIABLE TEMPERATURE applied to the whole BEAM. Is that possible? Obviously I would only like to see how it deforms on the direction of it's axis (as a BEAM is a 1-D element). The TEMPERATURE would go from 17 to 23 degrees in 6 hours (1 degree increment every hour) Thanks a lot in advance! Sergio
  3. Hi! I would like to make a transient analysis with temperature. I mean: Going for example from 17 to 23 degrees of the temperature of a body in 1 hour. Making steps of 10 minutes for example (total of 6 steps). I tried to do it with TABLED, TSTEP and creating a temperature LOAD but it doesn't work. It says : " *** ERROR # 2094 *** EXCITEID on TLOAD1 # 17 data references follower force or nonexistent DAREA/static loading with ID # 16." Could you help me? Big thanks in advance
  4. Hi, I'm modeling a stiffened sphere subjected to external pressure and to expansion due to high temperature. I performed a geometric non linear simulation considering only the external pressure and now I'd like to evaluate the effect of the high temperature. How can I include it in the analysis? I can't find nothing similar to the TEMP entry of the linear static Thanks, Enrico
  5. Hi everyone, I'm conducting coupled thermal/structural stress analysis using Optistruct. As structural loads, I have spcs (load collector:spc) and a rotational force (load collector:rotation using RFORCE as card image).As a thermal load I've linear temperature on the nodes belonging to one surface. For the thermal stress analysis, I've created another load collector named 'temperature' and then I've defined on the nodes linear temperature using the temperatures panel. The load type was set to TEMP according to tutorial OS-1100: Thermal Stress Analysis of a Printed Circuit Board with Anisotropic Material Properties. Then for the load step, I'm creating a single load step using analysis type 'linear static' defining the spcs and loads(rotation) and in the TEMP section I'm choosing 'temperatures' from the load collectors. However I become the following error: *** ERROR # 4800 *** Grid 15361 connected to element 44763 has no temperature specified in load set 3. To apply zero temperature on this grid, SYSSETTING,undeftemp,zero needs to be added to the deck. Can anyone help me solving this problem? Best Regards Mert
  6. 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
  7. 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.
  8. 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?
  9. I want the stress and displacement in a component due to change in temperature i.e the deformation due to change in temperature by 40 degree Celcius. How can this be done am not getting the option for temp diff.
  10. 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!
  11. Hi , I have large amount of nodal temperature loads applied on the model. Is there any way to visualize the temperature load using contour plots in hypermesh. Also , incase of PLOAD cards applied on the elements. Can we visualize applied pressure in hypermesh using contour plots? Thanks in advance. Girish
  12. Hi. I have applied a temperature of 35 °C (through the panel Analysis-->Temperatures) on some of the nodes of my model. When I open the file .fem the id of the node is right next to the value of the temperature. How could one understand what the value of the temperature is just by looking at the file .fem? He or she could say, in my opinion, that the temperature is 5, or 35, or 335... TEMP 3 237335.0 TEMP 3 237835.0
  13. I have to model a pipe using shell elements full of LOX (Liquid oxygen) which is at 20K surrounded by ambient temp of 293K. Please help me how to best solve this..
  14. Hello! It seems that it is not possible to specify more than one TEMP or TEMPD load in the TEMP option when defining a static loadstep in optistruct. It is not convenient since it would be nice to organize different temperature zones in different load collectors (for model organization purposes). I looked in the documentation and it seems that the TEMPERATURE Subcase Information Entry does not accept more than one set. Is it possible to put different loadcollector in a LOAD card and specify the LOAD card in the subcase information entry. I think it would require to set the LOADTEMP option to SHAREID in the OptiStruct Configuration File. I am just wondering if there was another way to do it? http://www.altairhyperworks.com/hwhelp/Altair/hw13.0/help/hwsolvers/hwsolvers.htm?temperature.htm Thanks in advance!
  15. Hello everyone I would like to know, what is the difference between creating a constraint, set its Card Image to TEMPD, set T1 with the temperature and to create 'temperatures' and set the value to the temperature? I thank you in advance for your help!
  16. The temperature that is specified in the SURFACE_INTEGRATED_CONDITION command corresponds to the "bulk temperature". The bulk temperature is defined as: Tbulk = 1/A * INTEGRAL( Â (rho * Cp * U * T) / ( rho_avg * Cp_avg * U_avg ) ) dA. This is a mass averaged temperature. The SURFACE_OUTPUT command returns the area averaged temperature.
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