If you’re an engineer who has dealt with large simulation models, you know there’s often a trade-off between accuracy and solution time. Submodeling is a technique you can use to reduce solution time without sacrificing accuracy of results.
A common strategy you can use to look at the overall behavior of an assembly or complex part of a large model is to simplify the model during preparation by removing small details, like fillets and holes. Simplifying models in this way can have a significant impact on run times. This simplification, while not excessively affecting overall model stiffness, may result in lower resolution of localized stresses. What you need, then, is a mechanism that allows you to “zoom in” on these details to examine behavior around specific areas.
Many structural analysis models that use shell elements consist of a large number of bodies that need to be connected together to create a valid analysis model. These structures are typically manufactured by welding, for example ship structures.
There are a number of methods that can be used in ANSYS Mechanical for creating this type of model, which requires the geometry to be meshed and connected. Continue reading
Many FEA applications can benefit from the ability to strategically modify a mesh during solution, in order to simulate challenging geometry distortions which otherwise cannot be solved. Unlike manual rezoning, mesh nonlinear adaptivity is completely automatic, requiring no user input during solution.
Have you ever wanted to break up a model in multiple different zones and then mesh each with the best method possible? What if that could be done automatically? And of course, all the zones should be mesh-conformal, and all the mesh should be high quality. That is what ANSYS multizone meshing is for. This post is to explain a bit more about how it works and I also included a rough little video about how to use it inside the ANSYS ICEM CFD meshing tool. Continue reading
ANSYS ICEM CFD has been using the Workbench CAD readers for a few years now, and for those of you using ICEM CFD in Workbench, it is drag and drop simple. But many of our stand alone ANSYS ICEM CFD users are not really aware of this functionality, so here is a blog about it.
In previous versions, we had the Workbench readers under “File => Workbench Readers”. The Workbench readers really supersede the old ANSYS ICEM CFD readers. They are up-to-date, easy to use, and offer connections such as JT Open and SpaceClaim that ICEM CFD never supported on its own. Talking to users, we found that many thought the Workbench readers option would only work inside Workbench or if they installed Workbench. To make the option more obvious, we moved the Workbench readers to the top of the list and renamed it “Import Model.”
Why “Import Model” instead of “Import Geometry”? Because the Workbench readers also support mesh formats! You can even select a *.wbpj and get both the geometry and mesh. During the import process, you can filter to make it easier to find the files that you are looking for. For instance, you can switch it to SpaceClaim to filter for SpaceClaim documents. Select your particular file (some formats will show you a preview of it), and click Open. Continue reading
When I look back over the last decade at the trends in CAE simulation, one thing that stands out is the increase in the general complexity of models being investigated. Today, with progresses in computing power and parallel computing, 3-D simulations are commonplace and geometries are less and less simplified. As a result, many CFD engineers choose to spend less time on geometry simplification and clean-up of corrupted geometries (for example gaps or holes) and solve larger models using the power of parallel simulations.
Prior to CFD analysis, we often have to extract the fluid volume of a given geometry. After all, we CFD engineers are often most interested in what is happening inside or outside the solid objects! Extracting the fluid volume from solid CAD entities using a Boolean tool at the geometry level is a great strategy for simpler geometries but can become extremely troublesome when the number of parts in an assembly increases and gaps or holes (geometry imperfections) exist. When you are looking at cases containing hundreds or thousands of parts, most engineer’s (including myself!) eyes start to glaze over at the very thought of preparing the geometry for analysis!
I just saw this really cool video about how researchers at Harvard University and the University of Buffalo looked at the stingray motion in water to think about a new design and propulsion system for submarines.
As you can see, they performed CFD simulation of the stingray motion. As soon as I saw the CFD animation I thought to myself — to do such a simulation, they need to have a good mesh morphing capability as the deformations are large. Why mesh morphing and not fast remeshing? Continue reading
Happy Friday and Happy New Year, folks! This week’s roundup looks at what we thought 2013 would look like 10 years ago, how engineers are getting creative to keep massive supercomputers cool, and a new computer-based method to figure out a drug’s side effects before it hits the market.
This week we have four new ANSYS webinars including a continuation of our Ask the Expert series. From San Jose, California at BIOMED Device to the CSIA-ICCAD 2012 in Beijing, China you’ll also find our experts at events where you can meet and discuss the latest advancements in simulation engineering technology.
Let’s begin with the ANSYS webinars. A reminder – if you miss one of our webinars you can access on-demand recordings via our Resource Library within a few days after the scheduled event.
ANSYS Webinars Ask the Expert Series
Improving Productivity with New Features ANSYS 14.5 for Geometry and Meshing
Wednesday, December 05, 2012
4:00 pm EST, 9:00 pm GMT (REGISTER)
A typical simulation workflow requires reading geometry, cleaning it, creating a closed body, generating mesh and reviewing mesh quality. For having a hex dominant mesh, additional geometry decomposition steps may be required. This process can be tedious.
In ANSYS 14.5, there are host of new features in ANSYS DesignModeler (DM) and ANSYS Meshing (AM) that makes preprocessing faster, more efficient and hence resulting in improved productivity for CFD and Mechanical workflows. These enhancements include support of newer CAD releases, usability for DM and AM, improved performance while dealing with large sized CAD geometry and hex dominant mesh in AM. Continue reading
Coming up this week on the ANSYS Events Calendar are several webinars you may want to attend. If you’re in the UK, we’re offering an Introduction to Fatigue Theory and Simulation Seminar. ANSYS fatigue simulation tools provide full life prediction from finite element results to answer the question“how long will it last?” or “will it pass the test?” before you even have prototype. Go beyond simplified stress analysis and avoid under or over-designing your products by simulating actual loading conditions.
Together with our fatigue life prediction partners, HBM nCode, ANSYS would like to invite you to this free half-day seminar that goes into the theory behind fatigue simulation and discusses the factors involved in life prediction, as well as some real life worked examples. It’s scheduled for tomorrow, but there’s still time to register! As always, ANSYS events are free to attend, but your registration is required.
Other ANSYS Events This Week
|July 17, 2012
||ANSYS Introduction to Fatigue Theory and Simulation
|July 17, 2012
||Computational Fluid Dynamics Applications for Offshore and Marine – 2012 Update
||All, All, Online
|July 18, 2012
||Ask the Expert – Best Practices for Meshing Complex CAD Geometries in ANSYS Icepak
|July 18, 2012
||Ask the Expert – Battery Cell Electrochemical and Thermal Modeling
|July 19, 2012
||Webinar – Computational Structural Mechanics Applications for Offshore – 2012 Update
||All, All, Online
In addition to this weeks events, you might want to add this one to your calendar!
Learn How Mesh Morphing Accelerates CFD-Driven Shape Modifications
Tuesday, July 31, 2012
9:00 am EDT, 1:00 pm GMT REGISTER HERE
This webinar will inform you how you can drastically reduce the simulation time to complete a set of design changes, without the burden of regenerating a geometry or mesh. RBF Morph is a unique mesh morpher that combines the very accurate control of geometric parameters with extremely fast mesh deformation, all fully integrated with the ANSYS Fluent solving process and Workbench Platform. Industrial application examples regarding External Aerodynamics, Multi-Phase and Internal Flows will be shown.