Orca3D Marine CFD
Orca3D Marine CFD is the combination of the Orca3D marine design plug-in for Rhino and the Simerics Multi-Purpose (MP) CFD software, to provide a fast, accurate, and easy-to-use CFD solution for the naval architect. By combining a specialized interface in Orca3D and a custom template in SimericsMP, we have brought an affordable, powerful, and proven set of analysis tools to the desktop of the designer, without the need to become a specialized CFD analyst.
Watch the Orca3D Marine CFD webinars:
Why use CFD?
- Eliminate or reduce model test cost and schedule
- Improve vessel performance
- Increase customer confidence in the performance of your design
With the Orca3D Marine CFD package, you can:
- Run resistance and self-propelled analyses for displacement and planing hulls
- Analyze monohulls and multihulls, with or without appendages
- Include any type of hull features (e.g., steps, trim tabs, etc.)
- Analyze longitudinal dynamic instability (porpoising) for planing hulls
- Compute water and air streamlines
Key benefits of the Orca3D Marine CFD package include:
- Easy to run with confidence, without the need to be a dedicated CFD analyst
- Benchmarked with proprietary and public-domain hulls, against full-scale data, model tests, and other analysis codes, with excellent results
- Fast solver; uses all cores available on the computer (up to 8 cores included in base price; additional cores available for an extra charge)
- Multiphase capability accurately models the free surface behavior
- Automated CFD volume meshing in Simerics, using Rhino surface meshes as input
- Automated setup of the domain and wave refinement zone, based on input from Orca3D
- Morphing domain grid, as the vessel heaves and pitches
- Animations of the simulation results (e.g., vessel acceleration, porpoising)
- 2D/3D display of simulation behavior including dynamic pressure, wave elevation, sinkage and trim, and more
There are two parts to the package; Orca3D Level 2 and Simerics CFD. You need both parts to run a CFD simulation.
The Orca3D CFD interface is included in the Level 2 package. The Simerics CFD code is available directly from us with a 3-month or 12-month license, as well as intermittent licenses that allow you to activate the software on a project-by-project basis. Want to learn how Orca3D Marine CFD could improve your design process? Let us give you a live, on-line demonstration, showing how quickly you can go from your Rhino/Orca3D model to accurate, high-fidelity results! Then request an evaluation license, to see for yourself how easy it is to get accurate results.
EXAMPLE BENCHMARKS (click to enlarge any graphics)
Wave Cut Comparison
Technical Papers and Presentations
The Prediction of the Planing Hull Resistance and Porpoising using RANS based CFD Tool
SNAME Maritime Convention 2017: Chengjie Wang, Hui Ding, Piotr Bandyk
The planing hull form has long been employed in modern marine vehicles design. Its good performance at high speed range makes it a good candidate for powerboats, yachts and high speed vessels. However, it is challenging to get accurate prediction on resistance as well as dynamics, i.e. porpoising. The semi-empirical and analytic methods widely used today are based on gross hull parameters, limiting their applicability and accuracy. These methods do not provide details of the flow around the hull and cannot reliably predict dynamic instabilities such as porpoising. In this paper, we present numerical simulations of a classical planing hull (Fridsma 1969) using a RANS based CFD tool and compare the predicted sinkage, trim, resistance, and porpoising behavior with experiments. In order to resolve the transient phenomena properly, the explicit Volume Of Fluid (VOF) method is applied to solve the free surface. The transient, steady, and possibly unsteady motions of the vessel are captured through an embedded dynamic solver. Good agreement is shown with experiments, including prediction of dynamics, and results can be achieved with practical turn-around times on a single workstation.
Orca3D Marine CFD for the MACC Simulation Grand Challenge
Multi-Agency Craft Conference 2018: Bruce Hays, George Hazen, Chengjie Wang, Larry Leibman
In this paper, we present numerical simulations of the US Navy General Purpose Planing Hull (GPPH) and a classical planing hull (Fridsma 1969) using a RANS based CFD tool, and compare the predicted sinkage, trim, resistance, and porpoising behavior with experiments. In order to resolve the transient phenomena properly, the explicit Volume Of Fluid (VOF) method is applied to solve the free surface. The transient, steady, and possibly unsteady motions of the vessel are captured through an embedded dynamic solver. Good agreement is shown with experiments, including prediction of dynamics, and results can be achieved with practical turn-around times on a single workstation. Semi-automated meshing and setup methods are described, with the goal of allowing naval architects who are not CFD specialists to obtain consistent and reliable results.
We at Viking have been interested in CFD for 15 years, and until now it was always just out of reach due to cost, processing requirements, and time. Orca3D Marine CFD now puts the power of CFD into our hands at a reasonable cost in both dollars and CPU requirements. The software is easy to use once you get the hang of it, and we found the training very helpful. Now we have the ability to run tank test resistance simulations any time we want, and do not have to wait for available time at the towing tank. Changes to the models can be made quickly and easily on the computer, whereas changes to our tank test model had significant limitations. Any time we have questions, the Orca3D and Simerics support is quick and to the point.
Joe Snodgrass, N.A., Viking Yacht Company
Having worked with Orca3D for several years, I was very excited to find out they teamed up with Simerics to provide user friendly CFD analysis. I believe this was the missing link to digitally verify any running surface issues before construction starts. In addition, to be able to accurately determine the influence of hull shape, weight, Center of Gravity, steps, strakes and running gear to the overall performance of a new design is invaluable. With unmatched support from Orca3D’s team, I was up and running with this program in no-time!
We just wrapped up our engineering trials on a new design, and we are very pleased with the results. Exceedingly happy with the accuracy of the simulations as they pertained to the arrangement of some of the hull details like spray strakes and fairings, etc. We also found a high degree of correlation between simulated and full scale effects of dynamic trim appliances (interceptors and trim tabs) which allowed us to choose the right appliance for this application right out of the box instead of having to trial several different types and arrangements. We took some risks with the hull form (that we would otherwise not have) due to having the data from the simulations to back up our ideas, and those risks taken certainly resulted in a better performing boat. This particular program was a trial run for the usefulness of CFD in the design phase, and our entire organization is convinced that there is a direct benefit to the product.
Airflow streamlines and free-surface elevation
Porpoising Planing Hull
Accelerating Hull with Dynamic Pressure and Free Surface Elevation