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FloEFD Technical Specifications

The 7 Key Technologies at the Heart of Concurrent CFD

Computational Fluid Dynamics (CFD) is a discipline devoted to numerically analyzing the flow behavior and the temperature and pressure within a fluid. Due to its mathematical complexity and esoteric input requirements, traditional CFD analysis has long been the province of expert specialists. This adds time and cost to mechanical design projects and discourages iterative design studies.

But fluid flow is an increasingly common part of product design, not only for obvious devices ranging from airplanes to hydraulic valves but for a wide range of products, e.g. electronic enclosures that must conduct cooling air to delicate circuitry. Today many enterprises are seeking solutions that their staff mechanical designers can use to perform CFD analysis routinely, efficiently and accurately.

Mentor Graphics has answered that demand with a breakthrough technology known as Concurrent CFD. This new solution is so named because it resides entirely within a mechanical CAD (MCAD) platform, where it is used concurrently with all the other tools in the normal menu structure. For the first time, mechanical engineers can treat CFD as a routine operation they can invoke from their CAD screen within diverse host CAD systems.

Concurrent CFD works because it automates the most onerous CFD steps—the same steps that once required the attention of a trained specialist. In particular these include transferring mechanical geometry to the CFD application, modeling internal cavities if needed, and creating a “mesh.” Concurrent CFD takes the geometry directly from the CAD application, automatically performs the necessary translations and cavity modeling, and generates an optimized mesh before executing its analysis.

In spite of its much-simplified operation, Concurrent CFD delivers robust flow analysis results quickly and accurately. By making fluid analysis easy, Concurrent CFD enables designers to validate their designs early and often, and if necessary, try out a succession of ideas without risking their project deadlines.

Concurrent CFD Solution

These key technologies set FloEFD apart from all other CFD codes:

Direct CAD-to-CFD Concept

FloEFD is based on CAD. Offering a fully-integrated solid modeler, with FloEFD you can create your geometry or, use existing 3D CAD geometry and solid model information including features and parameters to help you simulate your designs in real-world conditions. Either way, you will find FloEFD extremely intuitive and easy-to-use as it offers functionality not available in other CFD programs.

For example, most CFD programs require you to create phantom objects to represent the fluid (empty) regions - an extremely time-consuming process since you need to identify each region manually and then create geometry to fill it. FloEFD automatically differentiates between the solid and fluid regions and automatically creates the fluid domain. As a result, FloEFD frees you from the hassle of creating unnecessary geometry just to prepare a solid model for analysis.

Engineering vs. Analysis User Interface

FloEFD features an extremely easy-to-use user interface. Instead of dealing with technical jargon such as y+ value and Dirichlet Boundary Conditions, you deal with terms such as walls, inlets or outlets. In addition, FloEFD features a powerful analysis wizard that guides you through the set-up process. Therefore, you can focus on solving your problems as opposed to figuring how to use the software. As a matter of fact, FloEFD is so intuitive that most engineers report that they can use the software with less than eight hours of training.

Design Variant Analysis

Perhaps the most powerful feature of FloEFD is the ease with which you can conduct “what-if” analyses. FloEFD makes it easy to modify your models and then immediately analyze them. The process is quite simple: FloEFD helps you create multiple variations of your designs by modifying your solid model and without having to reapply loads, boundary conditions, material properties etc., you can analyze them. Simply compare the results among the many design options to choose the best possible design. It really is that easy.

Intelligent Rectangular Adaptive Mesh

While some vendors offer only a black-box approach, the meshing process with FloEFD is completely transparent and you retain as much or as little control as you need. As every CFD user knows, finding an optimum mesh can be extremely time-consuming. Mentor Graphics has developed a robust automatic mesher that can mesh real-world geometry – not just academic or theoretical ones. FloEFD features automatic meshing for fluid and solid regions including automatic mesh refinement/unrefinement due to geometrical and/or physical (solution adaptive) requirements. With FloEFD, your model will be meshed in the shortest time possible and with a high level of accuracy.

Modified Wall Functions

FloEFD features grid-independent near-wall modeling using Partial Cells technology. This technology enables you to simulate the boundary layer phenomena for fluid flow and heat transfer effects without needing a specifically designed mesh or a lot of time to solve the problem.

Laminar-Transitional-Turbulent Modeling

FloEFD does not require specific user input in order to simulate transitional flow characteristics since it supports laminar, transitional and turbulent flow regimes … all automatically and within the same model. Therefore you don’t need to worry about identifying when and where the flow characteristics change within your model. FloEFD will automatically do it for you.

Automatic Convergence Control

There is nothing more aggravating than setting up an analysis session and returning hours later to find that the software has failed to provide a solution due to numerical convergence problems. With FloEFD, you get real-time feedback about the solution progress such as the convergence of the solution, residual errors, monitor point values etc. Cutting-edge numerical methods with multi-grid schemes and robust convergence behavior in FloEFD ensure that you get engineering results in a timely manner.

 
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