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SPH Water Compression in LS-DYNA Tank Model
<div data-ogsc="rgb(0, 0, 0)">Hello,</div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">I am currently modeling a water-filled vessel in LS-DYNA. </div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">The vessel structure is modeled using shell elements, and the water is modeled using SPH particles.  The vessel is subjected to earthquake records. </div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">The adopted dimensions are ton-mm-s-N</div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)"> </div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">The issue I am encountering is that the water appears to compress excessively ( please see the video)</div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)"> </div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">EOS_MURNAGHAN</div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">K=2200 </div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">GAMMA= 7</div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)"> </div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">SPH SECTION</div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">CSLH 1.2</div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">HMIN 1 </div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">HMAX 1.1</div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)"> </div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">SPH CONTROL</div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">IDIM 1</div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">NMMNEIGH 250</div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">FORM 15</div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">MAXV 0</div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)"> </div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">BODY LOAD Y WITH DR</div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)"> </div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">Sph mass 17.3 ton</div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">Sph particle mass 0.0032 ton</div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">Number of sph particle 5409</div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)"> </div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">Sph material </div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">09- NULL</div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">RO 1.000e-09 </div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">MU=0</div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)"> </div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">Automatic node surface contact</div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">SFSA= 2</div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">FSSB= 1</div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">SOFT= 1</div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">SOFSC= 0.1</div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)"> </div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)"> </div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">I would appreciate it if you could share your recommendations on how to resolve this issue.</div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">Thank you in advance for your support.</div>
Avatar
amirhossein.nikpour@cern.ch February 19, 2026
Warning segment contains rigid body nodes
<p data-start="69" data-end="143">Hello,<br data-start="75" data-end="78">I encountered the following warning and would like to resolve it:</p><div class="contain-inline-size rounded-2xl corner-superellipse/1.1 relative bg-token-sidebar-surface-primary"><div class="sticky top-[calc(var(--sticky-padding-top)+9*var(--spacing))]"><div class="absolute end-0 bottom-0 flex h-9 items-center pe-2"><div class="bg-token-bg-elevated-secondary text-token-text-secondary flex items-center gap-4 rounded-sm px-2 font-sans text-xs">*** Warning 50186 (MPP+186)<br>    segment contains rigid body nodes<br>      tracked node ID        = 40242<br>      tied interface #       = 10<br>      segment nodes:<br>     56438 56522 56523 56439</div></div></div><div class="overflow-y-auto p-4" dir="ltr"> </div></div><p data-start="341" data-end="442">In fact, I used the <em data-start="361" data-end="397">Tie-Node-Surface-Constraint_Offset card to tie a solid element to a rigid body.</p>
Avatar
amirhossein.nikpour@cern.ch February 18, 2026
Issue with the Velocity Generation
<p>Hello,</p><p>I am working on space debris capture simulation using nets. I gave the initial velocity generation for the net in the direction of debris, so that I can observe the capture mechanism. The debris is fixed in space so it cannot move. However, the issue is that the net is moving away from the debris, exactly in the direction opposite to whatever i gave it. I fixed the co-ordinate systems, and also tried giving velocity in multiple directions, but no matter what i do, the net keeps moving away from the debris. Does anyone know how to fix this? I am kind of stuck and would appreciate any help. Thank you!</p>
Avatar
mintuboyapati@gmail.com February 13, 2026
Distorted Element Visualisation in Postprocessing
<p>Hello everyone,</p><p>I have the problem that my volumesh (2. Order Tet Elementform 17) looks normal in the preprocessing stage but looks distorted after being solved and the results (no Deformation) being loaded in the LS-PrePost Postprocessor. (Only fixed Boundarys, Implicit Dynamic). I dont know if this is only a Visualisation problem. Thank you for you help!</p><p>Picture in Preprocessor:</p><p></p><p>Picture in Postprocessor:</p><p></p>
Avatar
lars.gentner@audi.de February 13, 2026
Why does my prepost d3plots look like this
<p></p><p>AThe first d3plot looks fine, but every one after the first one starts looking like this. I have tried resaving folders, or doing the setup again froms scratch. Is it a mesh issue? </p><p>I exported Ansys workbench mesh as .k file, then opened in prepost to run. It was working fine, then i made a mesh refinement and did the same thing, now regardless what i do, when i open the post, the plots look like this. As if the index of the mesh cells got messed up or something. I have plotted graphs of energy etc, so my simulation is definitely not blowing up to cause this.</p><p>ALE axisymmetric no Lagrange bodies.<br>Does anyone know what is going on? Any help would be appreciated!</p>
Avatar
gl6fp@umsystem.edu February 11, 2026
ICFD mesh Initialization issue
<p>Hi - I am running an FSI simulation and my ICFD mesh cannot initialize.  I have a very fine mesh and mesh controls, MESH_BL, ICFD_CONTROL_GAP and other controls for the FSI mesh.  I am running into this error. "</p><p><br> Implicit dynamics is now active<br> ICFD::Mesh -> Start Mesh Generation<br> ICFD::Mesh: Initializing.</p><p>===================================================================================<br>=   BAD TERMINATION OF ONE OF YOUR APPLICATION PROCESSES<br>=   RANK 1 PID 3849779 RUNNING AT g040<br>=   KILLED BY SIGNAL: 9 (Killed)<br>===================================================================================</p><p> </p><p>I think it may be due to some of the folds in my parts (which is why I added the ICFD_CONTROL_GAP parameter). but I have not had this issue before until now. Any ideas? thanks</p>
Avatar
ah3616@columbia.edu February 9, 2026
Cohesive zone model – traction separation (MAT_COHESIVE_MIXED_MODE)
<p>Hi, I am learning LY-DYNA for my debonding model. I have watched some tutorial videos with a simple geometry (two metal strips boneded with adhesive) under Mode I fracture.</p><p>Here is what I did. </p>3 Geometry: two metal blocks and a layer of adhesive.Using 'Commands', MAT_138 (renamed) was added. <p></p><p>3. After meshing, I added PART (Beta) and SECTION_SOLID under LS-DYNA (D5) tree. PART geometry was the adhesive layer selected. I selected '8-noded, 4 point cohesive element' as 'Element formulation option' under SECTION_SOLID.<br><br>When I checked the error message in 'messag' file, it shows</p><p>" *** Error 40310 (SOL+310)<br>     Part ID 3 specified material type 1<br>     is not available for the cohesive element"</p><p>Can anyone help me with this? </p>
Avatar
daehan.sung@usu.edu February 6, 2026
Missing IDs in CONSTRAINED_INTERPOLATION in LS-PrePost v4.13.5
<p>Hello,<br>I am trying to check the *CONSTRAINED_INTERPOLATION card in LS-PrePost v4.13.5, but some IDs (ICID, DNID, INID) are not displayed.</p><p>This issue also occurs in v4.12.11, but it does not occur in v4.11.14 or earlier versions.</p><p>Is there any way to display these IDs (ICID, DNID, INID)?</p><p></p>
Avatar
azuma.toshiharu.g9@s.mail.nagoya-u.ac.jp February 6, 2026
Unrealistic Impact
<p>I am attempting to crush a block of MAT_63 Crushable foam between a completely constrained plate and a plate with 300kg mass. The simulation gives this output and the material just infinitely expands. Would anyone know any possible errors? Thanks.</p>
Avatar
s2671695@ed.ac.uk February 5, 2026
UMAT ANSYS 2025R1
<p>I am trying to validate the results in a journal paper for my M.Tech thesis work, in which they have used a hybrid consititutive model added into the ls dyna subroutine. To recreate the same thing I need to add the user defined material. I have sucessfully installed the latest veersion intel fortran compiler and microsoft visual studio. What steps do I need to follw to implement the UMAT in ls dyna and compile the constitutive model code.</p>
Avatar
pavan_m240846ce@nitc.ac.in February 4, 2026
SPH Water Compression in LS-DYNA Tank Model
<div data-ogsc="rgb(0, 0, 0)">Hello,</div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">I am currently modeling a water-filled vessel in LS-DYNA. </div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">The vessel structure is modeled using shell elements, and the water is modeled using SPH particles.  The vessel is subjected to earthquake records. </div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">The adopted dimensions are ton-mm-s-N</div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)"> </div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">The issue I am encountering is that the water appears to compress excessively ( please see the video)</div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)"> </div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">EOS_MURNAGHAN</div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">K=2200 </div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">GAMMA= 7</div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)"> </div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">SPH SECTION</div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">CSLH 1.2</div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">HMIN 1 </div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">HMAX 1.1</div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)"> </div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">SPH CONTROL</div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">IDIM 1</div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">NMMNEIGH 250</div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">FORM 15</div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">MAXV 0</div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)"> </div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">BODY LOAD Y WITH DR</div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)"> </div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">Sph mass 17.3 ton</div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">Sph particle mass 0.0032 ton</div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">Number of sph particle 5409</div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)"> </div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">Sph material </div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">09- NULL</div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">RO 1.000e-09 </div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">MU=0</div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)"> </div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">Automatic node surface contact</div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">SFSA= 2</div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">FSSB= 1</div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">SOFT= 1</div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">SOFSC= 0.1</div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)"> </div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)"> </div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">I would appreciate it if you could share your recommendations on how to resolve this issue.</div><div class="elementToProof" data-ogsc="rgb(0, 0, 0)">Thank you in advance for your support.</div>
Avatar
amirhossein.nikpour@cern.ch February 19, 2026
Warning segment contains rigid body nodes
<p data-start="69" data-end="143">Hello,<br data-start="75" data-end="78">I encountered the following warning and would like to resolve it:</p><div class="contain-inline-size rounded-2xl corner-superellipse/1.1 relative bg-token-sidebar-surface-primary"><div class="sticky top-[calc(var(--sticky-padding-top)+9*var(--spacing))]"><div class="absolute end-0 bottom-0 flex h-9 items-center pe-2"><div class="bg-token-bg-elevated-secondary text-token-text-secondary flex items-center gap-4 rounded-sm px-2 font-sans text-xs">*** Warning 50186 (MPP+186)<br>    segment contains rigid body nodes<br>      tracked node ID        = 40242<br>      tied interface #       = 10<br>      segment nodes:<br>     56438 56522 56523 56439</div></div></div><div class="overflow-y-auto p-4" dir="ltr"> </div></div><p data-start="341" data-end="442">In fact, I used the <em data-start="361" data-end="397">Tie-Node-Surface-Constraint_Offset card to tie a solid element to a rigid body.</p>
Avatar
amirhossein.nikpour@cern.ch February 18, 2026
Issue with the Velocity Generation
<p>Hello,</p><p>I am working on space debris capture simulation using nets. I gave the initial velocity generation for the net in the direction of debris, so that I can observe the capture mechanism. The debris is fixed in space so it cannot move. However, the issue is that the net is moving away from the debris, exactly in the direction opposite to whatever i gave it. I fixed the co-ordinate systems, and also tried giving velocity in multiple directions, but no matter what i do, the net keeps moving away from the debris. Does anyone know how to fix this? I am kind of stuck and would appreciate any help. Thank you!</p>
Avatar
mintuboyapati@gmail.com February 13, 2026
Distorted Element Visualisation in Postprocessing
<p>Hello everyone,</p><p>I have the problem that my volumesh (2. Order Tet Elementform 17) looks normal in the preprocessing stage but looks distorted after being solved and the results (no Deformation) being loaded in the LS-PrePost Postprocessor. (Only fixed Boundarys, Implicit Dynamic). I dont know if this is only a Visualisation problem. Thank you for you help!</p><p>Picture in Preprocessor:</p><p></p><p>Picture in Postprocessor:</p><p></p>
Avatar
lars.gentner@audi.de February 13, 2026
Why does my prepost d3plots look like this
<p></p><p>AThe first d3plot looks fine, but every one after the first one starts looking like this. I have tried resaving folders, or doing the setup again froms scratch. Is it a mesh issue? </p><p>I exported Ansys workbench mesh as .k file, then opened in prepost to run. It was working fine, then i made a mesh refinement and did the same thing, now regardless what i do, when i open the post, the plots look like this. As if the index of the mesh cells got messed up or something. I have plotted graphs of energy etc, so my simulation is definitely not blowing up to cause this.</p><p>ALE axisymmetric no Lagrange bodies.<br>Does anyone know what is going on? Any help would be appreciated!</p>
Avatar
gl6fp@umsystem.edu February 11, 2026
ICFD mesh Initialization issue
<p>Hi - I am running an FSI simulation and my ICFD mesh cannot initialize.  I have a very fine mesh and mesh controls, MESH_BL, ICFD_CONTROL_GAP and other controls for the FSI mesh.  I am running into this error. "</p><p><br> Implicit dynamics is now active<br> ICFD::Mesh -> Start Mesh Generation<br> ICFD::Mesh: Initializing.</p><p>===================================================================================<br>=   BAD TERMINATION OF ONE OF YOUR APPLICATION PROCESSES<br>=   RANK 1 PID 3849779 RUNNING AT g040<br>=   KILLED BY SIGNAL: 9 (Killed)<br>===================================================================================</p><p> </p><p>I think it may be due to some of the folds in my parts (which is why I added the ICFD_CONTROL_GAP parameter). but I have not had this issue before until now. Any ideas? thanks</p>
Avatar
ah3616@columbia.edu February 9, 2026
Cohesive zone model – traction separation (MAT_COHESIVE_MIXED_MODE)
<p>Hi, I am learning LY-DYNA for my debonding model. I have watched some tutorial videos with a simple geometry (two metal strips boneded with adhesive) under Mode I fracture.</p><p>Here is what I did. </p>3 Geometry: two metal blocks and a layer of adhesive.Using 'Commands', MAT_138 (renamed) was added. <p></p><p>3. After meshing, I added PART (Beta) and SECTION_SOLID under LS-DYNA (D5) tree. PART geometry was the adhesive layer selected. I selected '8-noded, 4 point cohesive element' as 'Element formulation option' under SECTION_SOLID.<br><br>When I checked the error message in 'messag' file, it shows</p><p>" *** Error 40310 (SOL+310)<br>     Part ID 3 specified material type 1<br>     is not available for the cohesive element"</p><p>Can anyone help me with this? </p>
Avatar
daehan.sung@usu.edu February 6, 2026
Missing IDs in CONSTRAINED_INTERPOLATION in LS-PrePost v4.13.5
<p>Hello,<br>I am trying to check the *CONSTRAINED_INTERPOLATION card in LS-PrePost v4.13.5, but some IDs (ICID, DNID, INID) are not displayed.</p><p>This issue also occurs in v4.12.11, but it does not occur in v4.11.14 or earlier versions.</p><p>Is there any way to display these IDs (ICID, DNID, INID)?</p><p></p>
Avatar
azuma.toshiharu.g9@s.mail.nagoya-u.ac.jp February 6, 2026
Unrealistic Impact
<p>I am attempting to crush a block of MAT_63 Crushable foam between a completely constrained plate and a plate with 300kg mass. The simulation gives this output and the material just infinitely expands. Would anyone know any possible errors? Thanks.</p>
Avatar
s2671695@ed.ac.uk February 5, 2026
UMAT ANSYS 2025R1
<p>I am trying to validate the results in a journal paper for my M.Tech thesis work, in which they have used a hybrid consititutive model added into the ls dyna subroutine. To recreate the same thing I need to add the user defined material. I have sucessfully installed the latest veersion intel fortran compiler and microsoft visual studio. What steps do I need to follw to implement the UMAT in ls dyna and compile the constitutive model code.</p>
Avatar
pavan_m240846ce@nitc.ac.in February 4, 2026

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