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Home / Rocky Current Release

Rocky Current Release

Rocky DEM 4.5: performance and expanded integration with Ansys software

Rocky DEM 4.5 simulation software is accelerating engineers’ use of particle modeling through improved computational speed, solver flexibility, and deeper integration with Ansys.

Fast solutions

Rocky 4.5 offers impressive speed across the board when compared to previous releases, with as much as 10x gains in calculation time.

Extended and deeper integration

Rocky 4.5 deepens integration with Ansys simulation software. Additional and new capabilities are available in four major areas: Multibody Dynamic (Ansys Motion), CFD-DEM (Ansys Fluent), Design Exploration (Ansys optiSLang), Simulation Data Management (Ansys Minerva).

Expanded Solver API

Over 30 new, ready-to-use modules have been added to the existing API library.

ESSS announces the newest release of its powerful Discrete Element Modeling software – Rocky DEM 4.5. This release delivers significant advances in solving particle dynamics engineering problems, enabling much faster solution of applications with large numbers of particles. Rocky DEM 4.5 also expands the innovation possibilities of particle-laden systems through expanded integration with Ansys simulation software, further supporting customers’ digital engineering strategies.

Rocky coupling with Ansys Motion creates the possibilities to simulate complex machine-particle interactions across multiple industries.

Release highlights include:

Increased ability to simulate free and rigid body motion through coupling with Ansys Motion multi-body dynamic software, helping engineers account for flexible components, kinematic forces, and link chains. Together with Ansys Motion, Rocky 4.5 performs analyses that consider the stress and deformation of flexible body components.

Simulation of motion and stresses of a backhoe – including flexible bodies and bushing fixtures using Rocky and Ansys Motion.

Expanded CFD-DEM capability now includes a broader range of particle-fluid applications, plus solutions for flows where particles are much larger than CFD mesh, all in a well-integrated workflow with Ansys Fluent.

Sample snapshots of enhanced Rocky Ansys Fluent post-processing from a particle drying simulation – Fluid and particle temperature (left), Fluid flow velocity and particle drying rate (right)

  • Seamless integration with Ansys optiSLang supports model calibration and enables large-scale design exploration for design optimization and verification. In addition, Rocky users can now generate reduced order models (ROMs) for their process simulations to implement digital twins in Ansys Twin Builder and on a variety of software and hardware platforms.
  • Integration with Ansys Minerva for efficient simulation processes and data management.
  • Multi-CPU and multi-GPU improved performance and scalability for all applications. Performance tests for this new release showed impressive advancement across the board when compared to previous releases, with gains ranging from 50% to 1000%, depending on the application type.
  • Expanded solver API and GUI customization support, with an additional 30+ ready-to-use specialized physical modules. Rocky 4.5 expands the existing API library template available for customers to download. With additional exposure, users can do even more with Rocky, like working on their own breakage models and custom CFD coupling laws.

Maliska added, “Our focus has always been to solve particle dynamics problems in timelines that are acceptable to engineers, while delivering top performance on accuracy, capabilities, and deeper integration into our customers’ simulation workflow using the Ansys software platform.”

One example of this performance improvement is the coupling with Ansys Motion.

“The Combination of Rocky and Ansys Fluent has given us access to an accurate and powerful simulation tool, and with release 4.5 we are looking to solve large, and complex coupled problems faster, while we take advantage of new physical models and modeling capabilities of Rocky 4.5.” added Mr. Boulet.

The Rocky 4.5 integration with Ansys Minerva enables users to better manage their particle simulation data and easily collaborate by sharing project information between stakeholders.

For more information, please join our Rocky DEM 4.5 launching event below, or contact us.

Rocky DEM release 4.4: reinventing solver customisation

Rocky DEM 4.4 delivers a totally new Solver Application Programming Interface (Solver API) based on the most-recent technology for customization and user experience integration. The result delivers unique usability, portability and, above all, solver performance.

What’s different in Rocky DEM 4.4’s Solver API?

User experience
All models implemented with the Solver API also modify and extend the setup and post-processing software interface. In the setup stage, to enter custom model input parameters, the software dynamically generates a visual interface; in the post-processing stage, all new custom variables are automatically available for detailed analysis. This enables seamless deployment of custom models built by experts, all across the corporation.

A single code for both multi-CPU & multi-GPU solvers
The Solver API provides a unified approach so users can program models by enabling just one single code to be compatible with both Rocky DEM solver technologies. This substantially reduces the cost involved in maintaining custom routines or learning complex GPU programming techniques.

No performance degradation
Custom models implemented using the Solver API run as fast as original embedded models. Rocky DEM provides a true application programming interface, and not just a “set of function hooks”. Users can implement their own models using the same structure and logics from embedded models, all without code virtualization or memory overhead.

“We wanted to deliver something innovative. We did not want our users to experience poor performance or miss out on any features. And worst-case, we did not want our customers to have to rewrite their code because they were now using the multi-GPU solver.” Marcos Cabral Damiani, Platform Development Manager at ESSS

The new Solver API in Rocky DEM 4.4 is C++ based, and it enables many new physics to be implemented — such as new contact and joint models, particle properties, body forces, and custom scalars.

“In the tablet coating process, tablet mixing, spraying and drying happen simultaneously and impact the final product quality. The Rocky DEM smart API provides capability to couple air flow, the heating and drying model, and tablet motion to capture the complex physics in the coater.” – Gopal Kasat, Project Manager from Tridiagonal Solutions

Other Rocky DEM 4.4 new functionalities include a custom particle input, the ability to freeze elements, and a user definition of center of mass and moment of inertia, with a focus on solid particles with complex shapes and high aspect ratios. Also, a new cylindrical periodic boundary condition is included as well as several other improvements.

By adding our new C++ Solver API together with the existing Python-based API for workflow automation, Rocky DEM 4.4 redefines what API means by delivering best-in-class functionality to customers who need flexibility without compromising performance.