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Junta

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  1. Hi everyone, I need to do a thermal cooling simulation for a transformer. The simple model is shown as below image: Normally, we run the simulation with water/air. However, the fluid used in this case is OIL. So can AcuSolve make the simulation with Oil? If yes, Is there any special setting has to be made? Furthermore, how should i define the interface b/w air and Oil (or water) in this case? Should i use multi-phase (level set/ Euler) or free surface or any other treatment? Thank you very much!
  2. Hi everyone, I'm trying a new feature in InspireCast named "Cycling". I need your help on my questions as below: 1. Based on my understanding, this feature will give you the result of mold temperature variation while working with multiple cycles. Is that true? 2. Take an example that i tried on ICast2020. The setting was made as below: i defined the duration time = 4s (the amount of time that the mold is open before beginning the next cycle) However, while checking the result, i found the duration time was 1200 second for 2 cycles. Is this a bug in the software? or if it's correct, could you explain for me about the timeline in this? Thank you very much!
  3. Hi everyone, Normally, when we running the forming analysis for some part, we will run feasibility first and try-out then. OneStep analysis provides a flatten Blank, but only in bounding lines, not surfaces. Then we need to use InspireForm to create the blank surface wireframe. However, it is Extremely Difficult to do this. IF always requires us to build another sketch, not directly fill in the lines to create the surfaces. But the sketch sometime doesn't capture the points well. We also cannot use "patch" tool in this case, because patch tool doesn't work with free lines. Meanwhile, HyperMesh can do this very well. So can anyone teach me how to create the surface efficiently with InspireForm? I'm struggling with it. Attached is the cad file of blank wireframe. Thanks in advance! Frt_Hood_Reinf_2017.0_Rectangle_OneUp_1.igs
  4. Hello everyone, In HyperMesh 2019 and previous versions, we usually use "BCs manager" to create the boundary conditions for Radioss (force, spc, displacement, velocity,...) In HyperMesh2020, BCs manager has been removed from Tool menu. How can we find it? To be honest, this is a very bad modification in v2020, especially for old users like me. We have already been familiar with using BCs manager. Hope there is a solution for this. If not, many users will deny using Hm2020. Thanks in advance!
  5. Hello everyone, I have some questions related to forming simulation which need your consultation. 1. The 1st question is about the “offset value” when creating the tools. a. By default, the offset factor when creating the tool is 1.2 (gap =1.2*blank thickness) This value is also applied for the die closing gap. It’s OK when we have only 1 part of the die set. Take an example for a single action draw, we have the top die face >> use offset tool to create the punch and binder face >> run simulation. b. However, sometimes, we are provided with a full set of die tools, including the top die, punch, and binder. And in the design, the gap is only equal to the blank thickness, for example = 1mm. So what should we do in this case? i. Take their design faces to use as tools, with the gap between die and punch = 1mm ii. Recreate the punch by offsetting the die face >> gap = 1.2 mm (as above) c. I have run a comparison for 2 cases above, the results are slightly different b/w 2 cases. Other parameters are set the same (mesh size, binder force, friction…) 2. The 2nd question is about the material density in HyperForm and InspireForm. Take an example for steel, rho = 7.8e-9 (ton/mm3) If I use the uniform mesh size (turn off adaptive mesh), the density is remained originally = 7.8e-9 t/mm3 However, when using both InspireForm or HyperForm with the “adaptive mesh = on”, The rho is increase 10 times >> new rho = 7.8e-8 (t/mm3) – check the model browser in HF So may I ask about the purpose of this? Is it used to increase the time step >> reduce solution time? And does it affect the result? Since I have also made a comparison b/w 2 cases: a. Uniform mesh size = 4mm (rho = 7.8 e-9) b. Min adaptive mesh size = 4mm (rho = 7.8e-8) The result are also slightly different. Thank in advance!
  6. hi can you give more detail about your case? Normally, take an example in the single action draw, the top die will be applied with the motion and the bottom binder will be applied with the force. For the binder, you can choose the force type as contant, linear or spring as you wished.
  7. hi alpha, In IF 2019 versions, you cannot do that command. In IF 2020, you can do that easily by holding SHIFT button and LMB click and drag.
  8. hi, It's true that the material density is increased 10 times larger, in order to increase time step >> reduce the solution time. For the begin card, it doesn't matter. You can remove it and still be able to run the simulation. Eventually, the unit system will be defined with the material specs. For example, rho = 7.8e-9 and E = 210000 MPa >> unit is mm and ton.
  9. hi, With incremental HyperForm, after you defined the forming process completely and "create input", there will be some entities added into HF model >> check the model browser. now, look at the property of the blank. The rolling direction will be defined with Vx, Vy, Vz values. By default, the Vx will be set as 1 >> indicate the rolling direction of the blank will be X-axis. You can modify the values to change the rolling direction as you wished. For the onestep analysis, i don't think the rolling direction will be defined.
  10. hi, you should build the model with HyperMesh and Radioss directly. With HyperForm, you can define the blank type as "solid". But i am not so sure about the performance of this feature. Normally, the blank will be "shell". You can try and give a feedback if possible.
  11. hi everyone, i have found the solutions for this. The 1st method is you need to uncheck "read INTIAL SHELL Data" in the solver options. The 2nd method is using the user process >> blank >> from file: However, the data of deformed blank (thickness, stress,strain) will now be stored in an include file .sta.hmx. The include file is generated when you import the blank by 2 methods above and it is stored in the directory of the original .sta. You also need to take care of the location of this include file. If the include file is deleted or removed to another folder, the solver will give error: "can not read include file" and stop.
  12. hi AcuPro, Thank you very much for your help. It's true that i followed the image in the tutorial :D Unbelievable that the instructions and the image are different. I don't know that the writer do the double check before publish the document or not :D
  13. hi everyone, i'm a HyperForm user. HyperForm is quite good and efficient. However, i feel very uncomfortable when using "auto process" in HyperForm. Since the layout of "auto process" is panel >> this make the graphics area becomes extremely small. i have change the settings in preference to window, but it doesn't change anything at all (for version 17, 19 and 20) How can i change the display mode to window as below image?
  14. hi AcuPro, Thanks for your reply. Please find the log file, out file, acs and fem file in attached.DCFSI.1.Log Please help me check the issue. Thank you! slab_dcfsi.fem DCFSI.acs slab_dcfsi.out
  15. hello experts, I have faced an error when doing AcuSolve tutorial Acu-T-5403 DCFSI. I have completely followed the tutorial step by step. The AcuSolve and OptiStruct solver started and coupled together. However, after a few time steps, the acuTail displayed below error: Did anyone face this issue before? What is the reason and is there any solution for this? Thanks in advance!
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