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Elements: An Engineering Simulation Blog

Serving the engineering simulation community and ANSYS and Rocky DEM users by sharing news, workshops, seminars, training, webinars, tips & tricks, and more.
Jul
07

Why is Meshing Important for Fluid Simulations?

Meshing has a significant role when it comes to the engineering simulation process. Creating a high-quality mesh is one of the most critical factors that should be considered to ensure simulation accuracy.

What is Meshing?

Meshing is the process in which the continuous geometric space of an object is broken down into thousands or more of shapes to properly define the physical shape of the object. The more detailed a mesh is, the more accurate the 3D CAD model will be, allowing for high fidelity simulations. Meshing, also known as mesh generation, is the process of generating a two-dimensional and three-dimensional grid; it is dividing complex geometries into elements that can be used to discretize a domain. Since meshing typically consumes a significant portion of the time in acquiring simulation results, advanced automated meshing tools can provide faster and more accurate solutions.

Why is Meshing Important?

Creating the most appropriate mesh is the foundation of engineering simulations. The mesh influences the accuracy, convergence, and speed of the simulation. Computers cannot solve simulations on the CAD model’s actual geometry shape as the governing equations cannot be applied to an arbitrary shape. Mesh elements allow governing equations to be solved on predictably shaped and mathematically defined volumes. Typically, the equations solved on these meshes are partial differential equations. Due to the iterative nature of these calculations, obtaining a solution to these equations is not practical by hand, and so computational methods such as Computational Fluid Dynamics are employed.

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Aug
06

Modeling Mixing Tanks Using ANSYS CFD

In manufacturing settings, a mixing tank is often used to prepare materials for production. Large amounts of materials are put into an enormous tank in order to blend components together through refined mixing.

cfd simulation of mixing tank processCFD Simulation of Mixing Tank Process
Mixing tanks are an important piece of equipment in industries such as:

  • Water/Effluent Treatment
  • Pharma/Bio-Tech
  • Biofuels
  • Cosmetics
  • Oil & Petroleum
  • Mineral Processing
  • Flue Gas Desulpherization
  • Paints & Coatings
  • Adhesives & Sealants
  • Polymer & Plastics
  • Mining
  • Chemical Processing

The $64,000 question for the manufacturer: Do the quality and consistency of the final mixture meet the intended goals? If not, what needs to change? Obviously, the manufacturer can adjust the material inputs, the speed of the mixer, and other factors through trial and error. However, this approach provides information only on the inputs and outputs. If I add so much of product A and so much of product B, and mix at a certain speed for a certain time and at a certain temperature, then I get product C. This method doesn’t offer much information on the actual mixing process itself.

Computational Fluid Dynamic (CFD) simulation software can provide much more insight into the mixing process, showing the manufacturer a detailed picture of what is happening inside the tank and how the materials are reacting over time. For example, what if the mixing process could be shortened by 30 seconds? What kind of economic impact would that make?

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Nov
27

Maximizing Memory Performance for ANSYS Simulations

Memory, or RAM, is important when you’re configuring computers for high-performance computing (HPC). Computer performance is affected not only by the amount of RAM but also by the amount of bandwidth, or transfer speed, between the processor and the memory. The bandwidth is affected by the speed of the memory stick, but the way memory sticks are configured on the motherboard is even more important.

CPUs can access information on multiple memory sticks in parallel through use of memory channels. Modern CPUs can access between 1 and 8 memory channels simultaneously (model specific). Not only does this capability affect the machines performance, but we have found that many computers are not configured to make use of all their memory channels, which hampers performance.

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Sep
26

New ANSYS 19.2 release offers Fluent improvements for faster CFD

ANSYS 19.2 Release

ANSYS 19.2 is now available for download from the ANSYS Customer Portal (registration & log-in required).

The big news with the release of 19.2 concerns ANSYS Fluent.

Over the last two years, the Fluids business unit at ANSYS, Inc. has undertaken a large initiative to overhaul the Fluent user experience and workflow with these goals in mind:

  • Provide a complete, integrated CAD-to-Post solution in Fluent
  • Streamline the Fluent meshing workflow for generating a mesh from imported CAD
  • Remove usability barriers for common tasks that frustrate users and waste their time

With ANSYS 19.2, they are delivering on these goals by releasing a task-based workflow with Mosaic Meshing that speeds up CFD simulations and helps engineers get accurate results with less training.

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