Welcome to the LS-DYNA Product Space

<p><p>I'm using a linear Eigenvalue Buckling analysis to create imperfect geometry for a Nonlinear Static Structural analysis by using UPGEOM to use a fraction of mode shape 1 and these are working as expected. Here is a video of that model: https://youtu.be/Iqqu92KL5Ko   An Explicit Dynamics (H) model using perfect geometry also works as expected.  </p><p></p><p>Now I want to use the same imperfect geometry in Explicit Dynamics (F) but the solver issues an error message.</p><p></p><p>The Tree Filter is disabled. I can't see any imported boundary conditions. </p><p>I created the Fixed Support and Displacement in Explicit Dynamics after the import.</span></p><p>Is there another way to import the imperfect mesh into Explicit Dynamics?  I am using Ansys Student 2025 R2.</p><p>I also used LS-DYNA (G) where I saw the Imported Boundary Conditions which I suppressed and created the same ones as Explicit Dynamics however I have not yet installed LS-DYNA to run the solver. I noticed that LS-DYNA Student is at 2025 R1.  Do I need to use Ansys Student 2025 R1 to create the cbd file from the Eigenvalue Buckling analysis or can I import the R2 cbd file into 2025 R1 to run the LS-DYNA solver?</p></p>

<p class="ds-markdown-paragraph">When simulating a hydrogen explosion using CESE CHEMISTRY, I combined the two sections in the model into a single part (30% premixed hydrogen), and it ignited normally.</p><p class="ds-markdown-paragraph">However, when I set the inner section as a 30% premixed hydrogen part and the outer section as an air part, ignition failed and a shift in the ignition point occurred.</p><p class="ds-markdown-paragraph">Similarly, when I set both the inner and outer sections as separate 30% premixed hydrogen parts (two parts in total), ignition also failed and the ignition point shifted.</p><p class="ds-markdown-paragraph">How can this issue be resolved? Thank you.</p><p class="ds-markdown-paragraph"></p><p class="ds-markdown-paragraph"></p><p class="ds-markdown-paragraph"></p>

<div>Dear colleagues,</div><div> </div><div>I'm solving problems involving the deformation of parts made of hyperelastic materials with viscous properties.</div><div> </div><div>I'm using TNV and Three-Networks models from the PolyUMod  library.</div><div> </div><div>Has anyone used these models to simulate the failure of parts made of these materials?</div><div> </div><div>Regards Valery</div>

<p><p><span data-olk-copy-source="MessageBody">I have been linking my custom material models (UMATs) into LS-DYNA using the LS-DYNA object files and my own Fortran code.  The version of the Intel Fortran compiler I use (v2019) is set to expire on Feb 28, 2026.  LS-DYNA has used this v2019 compiler version since 2019 and continues to use it to build its object files.  Intel is no longer supporting v2019 and is pushing users like me to use its free compiler.  Free is good, but I have tried, and I am unable to link code compiled with different compiler versions.  I, as well as many others, will soon be unable to add UMATs to LS-DYNA if a solution is not shared with us.</span></p><p><span data-olk-copy-source="MessageBody">Could you please connect me with someone who can confirm whether and how to link object files compiled with different compiler versions?  Or will ANSYS share object files built with a later release of the Intel Fortran compiler on a PC? Or are directions available on how to link LS-DYNA object files compiled with Intel Fortran 2019 to UMATS compiled in the 2025 free release of Intel Fortran? Or, better yet, will LS-DYNA share object files in a later release of Intel Fortran, e.g., oneAPI 2025 or 2026?</span></p></p>

<p>How should I set LS-Prepost to achieve the pressure cloud map style shown in the figure</p>

<p>I'm installing LSDYNAR version 5.1.1, but the machine code fails to generate during the installation process. What could be causing this?</p>

<p>I was trying to figure out LS-DYNA would be available for piping stress analysis using Elbow Beam.</p><p>So, I made two models for the comparison between regular beam (ELFORM = 1) and elbow beam (ELFORM = 14) under *LOAD_BODY_Y with structural mass only.</p><p>I guess the deformed configuration of the regular beam seems reasonable while one of the elbow beam unrealistic.</p><p>I know elbow element is still in beta but I think I have to use elbow element to incorporate the pressure stiffening effect into the analysis.</p><p>Is it a bad idea to use LS-DYNA for piping stress analysis for now?</p><p>By the way, I have found the NSM field in *SECTION_BEAM for elbow element would not work properly. I got a overestimated physical mass in "messag" file.</p><p></p>

<p><p>I tested LSPP version 4.10 to 4.13 in 3 different computers, there are same problems. </p>

<p>Workbench 2025R2 start support Mat187L. In workbench it only provide 2 options for "the strain rate caculation"? EQ1 is best but missed. Can Ansys correct it in next version? </p>

<p>PLEASE REQUESTED SIR COMPELTE THE MY INTERNSHIP </p>