Welcome to the LS-DYNA Product Space

<p>I use S-ALE for solution calculation. I want to set up some monitoring points that move along with the fluid to monitor the fluid velocity. I would like to learn the specific steps for setting up these monitoring points.</p>

<p>Hello everyone. I am modeling a set of wires clamped between two rings on both sides, a rubber layer below and above the wire, a total of 4 layers of wires.</p><p>The wire is modeled with beam elements to speed up the calculation. I apply a pressure of 7 MPa to the inner rubber cylinder. The rubber fills the space in the pipe and a plug is formed. After applying pressure and restoring kinetic energy, I apply a second pressure of 10 MPa to the outer rubber layer to check the tightness of the resulting plug.</p><p>One of the clamps can move along its axis when pressing the pressure on the walls.</p><p>At first, everything goes well, but at some point the rubber begins to penetrate through the wires, and at the second pressure it is strongly deformed.<br>I adjusted the contact rigidity, but this did not help. Please tell me other ways to stop the rubber from penetrating the wires?</p><p></p><p></p>

<p class="" data-start="239" data-end="461">I am working on a simulation where I need to compute the response of an object under two different loadings. The first loading is always the same, but it takes a long time to compute, while the second loading is different.</p><p class="" data-start="463" data-end="846">If I have to compute both loadings every time (first and second), the total computation time will be very long. My question is whether there is a way to use the solution from the previous K-file as initial conditions for subsequent runs? This would allow me to only compute the first loading once and then just focus on the second loading in future simulations, saving a lot of time.</p><p class="" data-start="848" data-end="1036">Is there a method to save the results from the first loading and use them as the starting point for future calculations? If anyone has a solution or any suggestions, I would appreciate it!</p><p class="" data-start="1038" data-end="1059">Thank you in advance!</p>

<p>Hi,</p><p>We are currently trying to run a set of simulations on TACC's Stampede3 using our own Linux executable for MPP DYNA, which has a user-defined material model. Is there any information/guidance on how to do this correctly (e.g. which files to move to the HPC and command lines to run analyses)? I reached out to TACC and they did not have any information on this besides the information on this link: https://docs.tacc.utexas.edu/software/ansys/.</p><p> </p><p>Thanks in advance</p>

<p>Hi, I'm trying to simulate an impact between a tube and rigid body, but I have now found that my impactor won't move although I gave it an initial velocity. The results in PrePost show the impactor just remaining stationary. I have run similar simulations before and they always worked. Thank you for your help.</p>

lsdyna磨削求残余应力和材料去除率

<p>Hello, I want to post two problems when I install LS-Dyan on Linux system. </p><div data-olk-copy-source="MessageBody">1. Parallel Computing with MPP: I’ve selected the MPP option for parallel computation, but I encountered an error message when trying to run it. Could you help me understand how to properly set it up for parallel computing?</div><div></div><p>2. <span data-olk-copy-source="MessageBody">When I used this command line to run K file, it give an error. But I can run this K file in LS-Run.</span></p><p></p><p>I welcome any feedback here.  Thank you!</p>

<p>Hello All,<br><br>I am trying to perform a dyanmic crash simulation in LSDYNA.<br><br>In the FE Model I have a part with two mesh sizes,<br>Size 1: with 3mm + 1mm(at thin areas) and Size 2: with 1mm mesh. Both are tetra meshed.<br><br>With my current timestep of E-4 the part was having huge mass addition that is why I decided to add the part in the SMS set but when I try to run the simulation,<br>with Size 1: I get out-of-range forces at a location which is far from the part in question.<br>and with Size 2: the simulation does not run at all. It's stuck before calculation go to the transient phase.<br><br>Did anyone face similar issues? Any suggestions are greatly appreciated.<br><br>Thank You.</p>

<p>Hello, I want to post a few cards I am currently using and ask why initial_contact_wear is not being written out into the dynain file.    Can anyone figure out why initial_contact_wear isn't writing out as intended?  I suspect my interface_springback_lsdyna card may be the culprit but I also tried leaving everything except for NCYC blank and it still won't do anything.    I tried removing my control cards entirely as well, also didn't have an effect. </p><p>I welcome any feedback here.  Thank you</p><p></p><p></p><p></p><p></p>

<div>Dear colleagues,</div><div> </div><div>I am solving a dynamics problem (implicit solver).</div><div>I set the acceleration on the base of the part, changing according to the harmonic law.<br><br><br><br></div><div><br>The part should perform harmonic movements, but the part only moves upward.<br><br>Below are the graphs of vertical displacement for two points of the part (upper and lower).<br><br></div><div></div><div>I will be glad to receive your advice.</div><div> </div><div>You can get the model from the specified link:<br>https://drive.google.com/file/d/1NlNCRUKt_v8xJjCql4Q8zPmE_34DxscK/view?usp=sharing<br><br>Regards Valery</div>