Fluid Dynamics are Engineer Ready in ANSYS 19.0

In early January, I spent two jam packed days in a room with over 60 of our best and brightest to exchange CFD best practices and learn what’s new for fluid dynamics in ANSYS 19.0. These are ANSYS Customer Excellence (ACE) team CFD engineers who work with you, our customers, to set up and solve the toughest simulation problems. In prior years, the presentations have focused on the latest physical models and capabilities. Certainly, those were represented. But this fluid dynamics technical meeting was predominantly about you, the engineer — discussing how to reduce risk  to provide the answers you need with the minimum investment of time and resources.

image of ANSYS summit participants learning ANSYS Fluids 19.0

The ANSYS Fluids Team

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How HPC Reduces CFD Simulation Time from Weeks to One Day

Some records are broken for glory, while others, like HPC, have more practical results. Compare 2017 Nathan’s Famous International Hot Dog Eating Contest champion Joey Chestnut’s record-breaking feat of eating 72 hot dogs (with buns) in 10 minutes during the annual July 4 contest to ANSYS, Saudi Aramco and King Abdullah University of Science and Technology (KAUST) shattering the supercomputing record by more than 5x. Chestnut was awarded the “Mustard Belt” for the 10th time, $10,000 and an additional 20,000+ calories for his impressive performance. By leveraging high performance computing, Saudi Aramco and KAUST worked with ANSYS to speed up a complex simulation of a separation vessel from several weeks to an overnight run! Continue reading

Initial Patching of Particles in DDPM or DEM in ANSYS Fluent

When simulating particulate flows using the dense discrete phase model (DDPM) or discrete element method (DEM) in ANSYS Fluent software, you might want to initialize the case with a certain region filled with particles. Examples of this include an initial static bed in a bubbling fluidized bed simulation and a partially filled rotary drum in a powder mixing simulation. Although it is possible to use standard DPM injection options to continuously inject particles until the desired quantity is reached, this approach is computationally expensive and impractical when the amount of particulate mass to be injected is large. Additionally surface injection from “interior” cell facets is not recommended as this option does not provide good control over injection and may lead to numerical instability.

So what are the options currently available?

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