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Hello everyone, I encountered some errors in the solver when calculating in LS-Dyna.1. When solving a problem without temperature analysis:2. When solving with temperature analysis:How can I fix them? Or is it not critical?
I have a big model where I'm solving a reacting flow using the CESE solver with Chemistry. I need to output the pressure and temperature values at certain elements only and with small timesteps. The problem is that the D3PLOT becomes too big if I choose a small timestep because all data is being saved for all elements. I tried to use the *CESE_DATABASE_ELOUT card but it doesn't give the correct output for chemically reacting flows (see the figure below). The other options for binary and ASCII output also don't seem to work with the CESE solver (*DATABASE_BINARY_D3PART, * DATABASE_ASCII, etc).Is there any other way to reduce the d3plot's without increasing the timestep or to output the CESE results for certain elements only?
Hello everyone, in LS-Dyna 2024 I use the BOX map.I do a calculation with particles and they fly apart a lot, I want to limit the calculation resource only to the desired area.I install the map but it always shows an error. Why? Thank you.
Hi,I am attemping running a SyC simulation example as provided by https://ftp.lstc.com/anonymous/outgoing/isheng/syc/. Yet, the LS-Dyna executable provided failed to start and reported a license issue, as attched below. FYI, I have to stick with this special version of the execuatble as it is using a few special keywords that are yet merged into the distributed versions (as explained in the documentation authored by Dr I. Yeh).I am using the Ansys License, hence the env variable LSTC_LICENSE is set as 'Ansys'.Could you please suggest me any solutions to this? Thank you.
How to resolve this error ? *** Error 20065 (STR+65) reading joint card no. user ID 80001 (# 1 in the input order) Node 1 in rigid body A and node 2 in rigid B are NOT coincident. Their Coordinates should be adjusted. *** Error 20067 (STR+67) reading joint card no. user ID 80001 (# 1 in the input order) Node 3 in rigid body A and node 4 in rigid B are NOT coincident. Their Coordinates should be adjusted. Node ID= 855013 *** Error 20065 (STR+65) reading joint card no. user ID 80003 (# 3 in the input order) Node 1 in rigid body A and node 2 in rigid B are NOT coincident. Their Coordinates should be adjusted.
Hi allI'm performing a collision simulation using AutoDyn. I would like to simulate two balls collide as follows:However, the simulation diverges too easily, with the error 'time step too small'.I want a stable analysis rather than an accurate analysis.For a stable analysis, how can i simplify the simulation? For this purpose, i tried the following:Element size: Increase the size of too small elements to set the time step appropriatelyMesh quality: Analysis settings so that elements are distributed more evenlyMass scaling: Use a stable time step by artificially increasing the mass of small elementsManual time step setting: Avoid stability issues by manually setting the time stepAdjusting physical properties: Adjust the physical properties of materials such as 𝐸, densityReducing non-linear effects: Reduce non-linear material modeling to reduce computational costsBut, all attempts failed.Any other suggestions?
Hello everyone.I am doing a drill fatigue calculation and also using thermal analysis. Tell me, will thermal analysis affect fatigue in fatigue calculations? For fatigue, the SN curve will be used and for thermal analysis, the MAT_THERMAL_ISOTROPIC map will be used.Thank you.
Hi everyoneI invstigate how soil media reacts on blast. In this problem I use Lagrange approach.First, I try used MAT_SOIL_AND_FOAM. In this way soil tensile but doesn't erode. After that, I tried MAT_FHWA_SOIL and again I didn't have result which I expect.I need to soil erode and flew away in different side after blast. What I need to do and what material model use. I think about SPH mesh. Could you please give me some advise how can I solve this problem.
Hello everyone, I encountered some errors in the solver when calculating in LS-Dyna.1. When solving a problem without temperature analysis:2. When solving with temperature analysis:How can I fix them? Or is it not critical?
I have a big model where I'm solving a reacting flow using the CESE solver with Chemistry. I need to output the pressure and temperature values at certain elements only and with small timesteps. The problem is that the D3PLOT becomes too big if I choose a small timestep because all data is being saved for all elements. I tried to use the *CESE_DATABASE_ELOUT card but it doesn't give the correct output for chemically reacting flows (see the figure below). The other options for binary and ASCII output also don't seem to work with the CESE solver (*DATABASE_BINARY_D3PART, * DATABASE_ASCII, etc).Is there any other way to reduce the d3plot's without increasing the timestep or to output the CESE results for certain elements only?
Hello everyone, in LS-Dyna 2024 I use the BOX map.I do a calculation with particles and they fly apart a lot, I want to limit the calculation resource only to the desired area.I install the map but it always shows an error. Why? Thank you.
Hi,I am attemping running a SyC simulation example as provided by https://ftp.lstc.com/anonymous/outgoing/isheng/syc/. Yet, the LS-Dyna executable provided failed to start and reported a license issue, as attched below. FYI, I have to stick with this special version of the execuatble as it is using a few special keywords that are yet merged into the distributed versions (as explained in the documentation authored by Dr I. Yeh).I am using the Ansys License, hence the env variable LSTC_LICENSE is set as 'Ansys'.Could you please suggest me any solutions to this? Thank you.
How to resolve this error ? *** Error 20065 (STR+65) reading joint card no. user ID 80001 (# 1 in the input order) Node 1 in rigid body A and node 2 in rigid B are NOT coincident. Their Coordinates should be adjusted. *** Error 20067 (STR+67) reading joint card no. user ID 80001 (# 1 in the input order) Node 3 in rigid body A and node 4 in rigid B are NOT coincident. Their Coordinates should be adjusted. Node ID= 855013 *** Error 20065 (STR+65) reading joint card no. user ID 80003 (# 3 in the input order) Node 1 in rigid body A and node 2 in rigid B are NOT coincident. Their Coordinates should be adjusted.
Hi allI'm performing a collision simulation using AutoDyn. I would like to simulate two balls collide as follows:However, the simulation diverges too easily, with the error 'time step too small'.I want a stable analysis rather than an accurate analysis.For a stable analysis, how can i simplify the simulation? For this purpose, i tried the following:Element size: Increase the size of too small elements to set the time step appropriatelyMesh quality: Analysis settings so that elements are distributed more evenlyMass scaling: Use a stable time step by artificially increasing the mass of small elementsManual time step setting: Avoid stability issues by manually setting the time stepAdjusting physical properties: Adjust the physical properties of materials such as 𝐸, densityReducing non-linear effects: Reduce non-linear material modeling to reduce computational costsBut, all attempts failed.Any other suggestions?
Hello everyone.I am doing a drill fatigue calculation and also using thermal analysis. Tell me, will thermal analysis affect fatigue in fatigue calculations? For fatigue, the SN curve will be used and for thermal analysis, the MAT_THERMAL_ISOTROPIC map will be used.Thank you.
Hi everyoneI invstigate how soil media reacts on blast. In this problem I use Lagrange approach.First, I try used MAT_SOIL_AND_FOAM. In this way soil tensile but doesn't erode. After that, I tried MAT_FHWA_SOIL and again I didn't have result which I expect.I need to soil erode and flew away in different side after blast. What I need to do and what material model use. I think about SPH mesh. Could you please give me some advise how can I solve this problem.
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