Learning Forum

[emsantos]

Reviewing the System Coupling User's Guide (Release 2026 R1), the list of supported coupling participants includes Mechanical/Mechanical APDL, Fluent, CFX, Forte, Electronics Desktop/Maxwell, FMU, Thermal Desktop, Rocky, and Files - but LS-DYNA does not appear in this list.

Therefore, if possible, I'd like to clarify the current status of coupling between Ansys Rocky (DEM) and LS-DYNA.

 

So far, I've found clear documentation for:

 

- Rocky ↔ Ansys Mechanical (1-way and 2-way, via System Coupling)

- Rocky ↔ Ansys Fluent (CFD-DEM)

- LS-DYNA participating in System Coupling with Fluent and MAPDL

- A sequential/homogenization workflow linking Rocky → Multiscale.Sim → LS-DYNA (Cybernet's Multiscale.Sim add-in), which is one-way and does not preserve time-resolved feedback between the two solvers

 

My specific questions:

 

• Is direct two-way co-simulation between Rocky and LS-DYNA officially supported today (2026 R1/R2)? If so, is it via System Coupling, or another mechanism?
• If supported, is LS-DYNA's participant status in System Coupling still a beta/experimental feature for this type of coupling, or has it reached production maturity?
• Are there known limitations regarding the time-step mismatch between Rocky's DEM solver and LS-DYNA's explicit time integration (microsecond-scale)? Is subcycling or another mechanism used to reconcile this?
• Is there a reference case, tutorial, or technical manual (beyond the general System Coupling User's Guide) that documents this specific Rocky↔LS-DYNA workflow?
• What licenses/executables are required (e.g., a special LS-DYNA build with SyC DLLs, as required for LS-DYNA↔Fluent coupling)?

Any pointers to official documentation, technical support cases, or example projects would be greatly appreciated.

Thanks in advance!

[Nanda]

Hello User,

Please give us sometime to check on this.

Regards,

Nanda.

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