# gopal_rathore

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• ### polypla_aoki

Hi Can you share more details on it
2. ## H3D

Hi, Can you share engine file. It will be of format name_0001.rad
3. ## Radioss student version solver issue

Hi, There will be limitations in student version Can you check on small model of say 10000 nodes. Is that running to ensure if its due to node limitation
4. ## Difference between INIVEL/AXIS x IMPVEL x INIVEL

Hi, INVEL/ means a body is given some initial translation velocity in x , y or z direction . For eg. you want to do a drop test of a phone from a height of say 1 meter. IN this case, we wont be simulating the phone free fall and instead we will give some initial velocity just before it hits the ground which it acquires due to gravity. This reduces simulation time INVEL/AXIS means a body is given some initial rotational velocity about x , y or z direction .For eg. a car rollover case IMPVEL means we are imposing the body to follow a certain velocity vs Time plot. In your case I think if your gears have certain velocity with time, you can use IMPVEL and if you want to give initial velocity about an axis use INVEL/.AXIS
5. ## Energy Balance at Impact Simulation

Hi can you share .rad file in 130 format? Can you share energy plot of the run?
6. ## Quasi Static Analysis Radioss

Hi, Please find the remarks below: 1) The analysis run is though explicit technique. As there are no specific cards for implicit run. You can also check the time step where in explicit schemes uses relatively very low time step than implicit schemes. Quasi static is type of physics which lies in between dynamic analysis and static analysis which refers to slow ramp up of loading forces. It is non-linear or linear depends on the type of material , contact definition etc. But as you mentioned you are working on truss problem where in most of the parameters will be in linear domain as we don want any non-linear behaviour in such designs 2) For a quasi-static analysis, you can also use Optistruct for solving as less non-linearity parameters are expected in your truss model 3) Yes it is for material failure. For a truss we can check failure with stress values itself and compare it with material yield values. As we do not want the stress to go beyond the yield and also have factor of safety of say 1.5-2
7. ## modal transient analysis

Hi, How can we predict the accuracy of modal based transient solution like convergence is seen in direct transient analysis Thank you
8. ## modal transient analysis

Hi, I am working on shock response transient analysis using modal superposition method. As this requires a pre-requisite of solving normal modes analysis . I wanted to know how many modes to be captured for transient run. Does this depend on effective mass ratio or on participation factor? Or are there any thumb rules or guidelines for the same My shock response analysis is for 30 ms Thank you
9. ## Negative hardening parameter in NLSTAT thermal analysis

Hi, I have got temperature mapped on the nodes of the mesh and are in the range of 550K -599 K.To consider this temperature values , I have ,made two stress-strain curves i.e one at 373 and second at 573 Order in TABLEST is 373 K and then 573 K Does the solver goes for linear interpolation between tow temperature values? let me know if there is any ambiguity in the table
10. ## Negative hardening parameter in NLSTAT thermal analysis

Hi, I am working on a NLSTAT thermal analysis where I have a temperature dependent material properties (at two temperature conditions) Used the foll. material cards: 1) MAT1 , MATS1 Used TABLSE S1 along with TABLE ST FOR Stress-Plastic strain curve and temperature value Facing the foll. error now *** ERROR # 3017 *** Negative hardening parameter H = -22964.325723 found. Negative value of H violates Drucker's stability postulate. This error prevents further computations and must be corrected.
11. ## Coupling thermal and CFD results

Hi, It is solved by exporting temperature into ASCII file and then loading the file in the temperature load case as .txt file With foll. order of information x-coordinate y -croodinate z-coordinate temperature
12. ## Coupling thermal and CFD results

Hi, Currently the model has been solved in fluent and I have got the nodal temperatures from there Can we use those in optistruct directly Working on comparison with Acusolve also
13. ## Coupling thermal and CFD results

Hi, I have solved a steady state CFD case of exhaust manifold in ANSYS Fluent. I have obtained the temperature distribution over the wall of the manifold and now would like to use the same for assessing the thermal stress in the manifold in optistruct For the same, I wanted to know how can we get the temperature load applied in optistruct from fluent Thank you
14. ## Applying acceleration load for linear static analysis

Hi, I did the first option, but as this being a buckling mode check analysis where mass will play important role. If I make density as zero, mass becomes zero
15. ## Applying acceleration load for linear static analysis

Hi @Ivan Any alternative to do such in 13 version
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