https://community.cadence.com/cadence_technology_forums/physical-system-simulation/dytran/en-USTelligent Community 13https://community.cadence.com/cadence_technology_forums/physical-system-simulation/dytran/f/dytranTue, 29 Sep 2026 14:43:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:3fecf462-2ce6-40aa-95fe-093baca45919https://community.cadence.com/cadence_technology_forums/physical-system-simulation/dytran/Tue, 29 Sep 2026 14:43:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:8a74cbe5-b993-4f84-bdf7-f615e50d2ea5https://community.cadence.com/cadence_technology_forums/physical-system-simulation/dytran/f/dytran/74106/dytran-2025-2-highlightsThu, 23 Oct 2025 13:06:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:94ff953c-7c79-4890-b210-dc4045ec357cShank Kulkarni1. Usability Enhancements for Output Requests Local Coordinate System Support: Time-history files can now be generated in local (stationary or moving) coordinate systems, not just the global one. → Provides greater flexibility and precision for post-processing node- and body-level results such as translations, velocities, accelerations, and forces. FSI Output Enhancements: New capability to extract center of gravity (CoG) for parts modeled using Eulerian elements. → Especially valuable for sloshing simulations to analyze effects of baffles or design features. → Adds to existing mass, volume, and energy outputs for more complete fluid behavior insights. 2. New Strain-Based Composite Failure Model Introduces strain-based damage initiation and layer-wise damage tracking . Supports element deletion to realistically capture progressive composite failure. Enhances prediction accuracy for complex events such as bird strike or high-impact analyses. 3. Rigid Body Contact Performance Improvements Optimized for flexible–rigid interactions (e.g., sheet metal forming ). Delivers major parallel processing and scalability improvements , reducing runtime significantly. Achieved through enhanced memory management and refined surface contact calculations , ensuring better solver efficiency.Dytranhttps://community.cadence.com/cadence_technology_forums/physical-system-simulation/dytran/f/dytran/73896/what-s-the-best-way-to-model-a-tension-only-member-in-dytran/1431861Fri, 13 Jun 2025 12:58:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:2cb30dd2-40d3-41e6-b595-85cffc143cadShank KulkarniThank you Anilhttps://community.cadence.com/cadence_technology_forums/physical-system-simulation/dytran/f/dytran/73896/what-s-the-best-way-to-model-a-tension-only-member-in-dytran/1431822Tue, 03 Jun 2025 11:30:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:a71c3e68-db89-4ef0-b787-89297e612e1cAnil.Puthiya VeetilHi Shank, We can model seatbelts in multiple ways using DYTRAN. Purely 1d based seatbelt model and a hybrid modelling using a combination of 1d and 2d mesh. For 1 D belt, Special belt elements with following characteristics are used. Tension only nonlinear springs and mass User defined loading and unloading belt characteristics Internal damping to prevent vibrations Pre stress / additional slack Also a special algorithm to model contact between dummy and belt. PBelt property card is used for the belt element referenced by CROD entry. For Hybrid modelling use PShell with membrane properties and fabric material characteristic for 2D shell part and PBELT for 1D part Hope this is useful and if you require more info let me know Anil anil.veetil@heaxagon.comhttps://community.cadence.com/cadence_technology_forums/physical-system-simulation/dytran/f/dytran/73896/what-s-the-best-way-to-model-a-tension-only-member-in-dytranMon, 02 Jun 2025 14:40:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:c56670f5-f106-47e3-bd8e-312939803a7aShank KulkarniHi, does dytran have any inbuild element which takes load only in tension? Or do I have to define this behavior in material model? Looking for simulations something like strap of seat belt. Thanks.https://community.cadence.com/cadence_technology_forums/physical-system-simulation/dytran/f/dytran/73835/is-there-a-way-to-set-up-parallel-processing-for-dytran/1431699Tue, 08 Apr 2025 09:12:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:d25a6b80-c1f3-4d32-be5a-72e1ed5ee5d1Shank KulkarniThank youhttps://community.cadence.com/cadence_technology_forums/physical-system-simulation/dytran/f/dytran/73835/is-there-a-way-to-set-up-parallel-processing-for-dytran/1431698Tue, 08 Apr 2025 08:09:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:a9bb325d-c13a-458f-aa49-7ec0372097e0Anil.Puthiya VeetilHi Shank Dytran supports both Shared memory (SMP) and Distributed memory (DMP) for parallelization of your run (You can find more info under Dytran User's Guide, Dytran Documentation). You need to install either Microsoft MPI or Intel MPI first. I recommend using Microsoft MPI which you can downloaded from the Microsoft software center, free of cost (https://www.microsoft.com/en-us/download/details.aspx?id=105289). Once it is installed please activate the MPI option in the DYTRAN Explorer as shown below (Tools/Options/MPI/Microsoft MPI). You are now ready to use the parallelization in DYTRAN. Hope this helps you. If you need any other help please contact me. Anil Veetil anil.veetil@hexagon.comhttps://community.cadence.com/cadence_technology_forums/physical-system-simulation/dytran/f/dytran/73835/is-there-a-way-to-set-up-parallel-processing-for-dytranThu, 03 Apr 2025 13:30:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:8f302fc6-041d-4ad4-a9bd-8764e0065c5cShank KulkarniI am using Patran for setting up dytran model and then using dytran explorer to submit the job. How can I setup parallel processing for my model as it takes long time to run due large number of elements. Thanks.https://community.cadence.com/cadence_technology_forums/physical-system-simulation/dytran/f/dytran/73820/is-it-possible-to-model-fluid-viscous-effects-in-dytran/1431657Wed, 26 Mar 2025 17:09:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:63057186-d8c7-464e-a8ed-908a8fc0c04aShank KulkarniYes, Dytran allows for the inclusion of fluid viscosity and frictional drag/loss in the Euler solver. Viscous effects can be included in both gases and liquids. It is activated by setting the viscosity entry on the EOSNA, EOSTAIT, EOSEX, or EOSGAM options. When viscosity is active, the Euler equations are replaced by the Navier-Stokes equations. However, it is important to note that heat transfer and heat generation by viscous dissipation are not considered. A no-slip condition is enforced at the boundaries, which is crucial for simulating viscous effects accurately. More details can be found in knowledge base article here: https://simcompanion.hexagon.com/customers/s/article/viscosity-in-dytran-kb8011578https://community.cadence.com/cadence_technology_forums/physical-system-simulation/dytran/f/dytran/73820/is-it-possible-to-model-fluid-viscous-effects-in-dytranWed, 26 Mar 2025 16:47:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:6c4632ce-94a0-4c05-849e-453bb8523a17Anup PaulDoes Dytran allow for the inclusion of fluid viscosity and frictional drag/loss in the Euler solver? If yes, can viscous effects be included in gases and liquids?https://community.cadence.com/cadence_technology_forums/physical-system-simulation/dytran/f/dytran/73806/spring-element-extension-does-not-match-theory/1431656Wed, 26 Mar 2025 16:34:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:3a4f25e4-6a64-40e8-86c4-6f9f32987145Shank KulkarniThat's interesting. Then another possibility would be that the model is overdamped. It might seem like everything is settled down but may not have actually reached steady state. How are you applying the damping? And if you plot the deformation vs time graph, how does that compare with the theoretical one?https://community.cadence.com/cadence_technology_forums/physical-system-simulation/dytran/f/dytran/73806/spring-element-extension-does-not-match-theory/1431631Tue, 18 Mar 2025 03:25:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:efea295e-f3bb-49f3-a0b2-7d2bc5e01d95Gavril BirsanuHi Shank! Thank you for your reply! I should have mentioned the the system is damped and the value of 68.12 mm is obtained after everything settles.https://community.cadence.com/cadence_technology_forums/physical-system-simulation/dytran/f/dytran/73806/spring-element-extension-does-not-match-theory/1431627Mon, 17 Mar 2025 11:24:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:82de467a-85f9-45bc-ab32-218c084b758dShank KulkarniHi Gavril, The reason for this discrepancy would be that the simulation is not being pure static. Dytran is an explicit solver , which means it is primarily designed for transient dynamic simulations (e.g., crash, impact, blast, drop tests). Explicit solvers do not perform true static equilibrium calculations as an implicit solver (like MSC Nastran SOL101 or Marc) would. If your simulation is not purely static, the mass might be oscillating around the equilibrium position, especially if there's no damping. This can momentarily lead to larger displacements. Try adding damping or running the simulation for a longer time to see if it settles at the expected 34.073 mm.https://community.cadence.com/cadence_technology_forums/physical-system-simulation/dytran/f/dytran/73806/spring-element-extension-does-not-match-theoryMon, 17 Mar 2025 10:04:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:17390c47-8183-44c5-982d-4cdc4b7c3129Gavril BirsanuI'm running a basic simulation of a 0.650-tonne mass point attached to a 5000 mm long linear spring element (PSPR) with a stiffness of k =187.144 N/mm. The gravitational acceleration is set to g = 9807 mm/s². Using the formula x = m*g / k , the expected static extension of the spring is approximately 34.073 mm. However, when running the simulation in Dytran, the spring stretches to 68.12 mm—almost double the theoretical value. The same discrepancy occurs when replacing the spring with a ROD element, using E = 1532 MPa and A = 61.07 mm². What could be causing this discrepancy?Dytranhttps://community.cadence.com/cadence_technology_forums/physical-system-simulation/dytran/f/dytran/73520/doubt-about-implement-a-pressure-time-and-space-varying-starting-from-dytran-results/1431343Wed, 27 Nov 2024 16:39:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:3a33500a-8aab-4cda-8bc4-933903859dc2Shank KulkarniTo apply a time-varying pressure field extracted from a previous simulation step to a deformable structure in Dytran/Nastran, you need to map the pressure data onto the structure's surface as a spatial and temporal field. This involves using the pressure data from the .arc file and defining it in a way that Dytran can apply it as a dynamic load over time. In short process should be like this: Extract Pressure Data : You have already extracted the pressure data over time from the coupling surface in the first step of your simulation. This data is typically stored in an archive file (.arc). Prepare the Pressure Data : Ensure that the pressure data is formatted correctly for use in Dytran. This involves organizing the data so that it can be applied as a load over the structure's surface. The data should include spatial coordinates and corresponding pressure values at each time step. You might have to write some scripts to automate the things here if data is large. Define a Spatial Field : In Dytran, you can define a spatial field that maps the pressure data onto the structure. This involves specifying the nodes or elements on the structure where the pressure will be applied. You can use the TABLED1 entry to define a time-dependent table of pressure values that correspond to the extracted data. Apply the Pressure as a Load : Use the TLOAD1 or TLOAD2 entries in Dytran to apply the time-varying pressure as a transient dynamic load. These entries allow you to specify the time history of the load, which can be linked to the TABLED1 entry that contains your pressure data.https://community.cadence.com/cadence_technology_forums/physical-system-simulation/dytran/f/dytran/73520/doubt-about-implement-a-pressure-time-and-space-varying-starting-from-dytran-resultsThu, 14 Mar 2024 16:06:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:b186f88c-bc5a-4cf0-88f5-2ff8327c803aJacopo BardianiI want to do an UNCOUPLED underwater explosion so: 1° step : explosion against a cylinder (euler domain + structure), where the cylinder is RIGID. After this step, I extract the pressure over time for the coupling surface of the structure; -> I'm able to do it! 2° step : I will study only the DEFORMABLE structure in Dytran/Nastran (Transiet analysis), with specific boundaries, subjected to the time-varying pressure obtained from the previous step. I'm able to extract the pressure in the coupling surface (in an .arc file) but now I don't know how to apply it to the structure. I would like to use a spatial field to map the pressure on all point of the structure but for all instants (so not only a spatial field but also a time-varying non spatial field). Could someone help me?Dytranhttps://community.cadence.com/cadence_technology_forums/physical-system-simulation/dytran/f/dytran/73517/tutorials-for-water-pressure-simulation/1430884Tue, 12 Mar 2024 06:59:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:1bb8fcaa-56e9-4dc3-8d0e-9257c85d62ecAnil.Puthiya VeetilHi Luis, There is no specific example problems similar to what you want to achieve. However, Euler solver is capable of performing what you want to simulate. Can we have a call to understand your problem and discuss the simulation options. Please get back to me on my email anil.veetil@hexagon.com.. Regards Anilhttps://community.cadence.com/cadence_technology_forums/physical-system-simulation/dytran/f/dytran/73090/are-there-any-available-tutorials-which-show-setup-of-a-dytran-drop-test-analysis/1430883Tue, 12 Mar 2024 03:35:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:5745d001-00a1-45a1-adcd-d6c81eb0f9b8jciecDo You have that and any other useful workshops ? I will be very grateful for sending to email..https://community.cadence.com/cadence_technology_forums/physical-system-simulation/dytran/f/dytran/73517/tutorials-for-water-pressure-simulationMon, 11 Mar 2024 09:07:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:cd45eabc-6c3d-4801-9ad4-3c8845e2cbf0luis.dramirezHello, I am trying to create a Dytran simulation that simulates how when washing a car you throw water at a specific velocity to a window and see how it affects a seal. Has anyone seen a tutorial similar to this scenario that can help me? . Thank you and any comments are appreciatedDytran