Application Brief

June 15, 2020

Best Practice – Scale-Resolving Simulations in Ansys CFD – Application Brief Version 2.0

While today‟s CFD simulations are mainly based on Reynolds-Averaged Navier-Stokes (RANS) turbulence models, it is becoming increasingly clear that certain classes of flows are better covered by models in which all or a part of the turbulence spectrum is resolved in at least a portion of the numerical domain. Such methods are termed Scale-Resolving Simulation (SRS) models in this paper.
June 12, 2020

Harmonic Analysis Speeds Solutions for Challenging Transient Blade Row Problems – Application Brief

Accurate and efficient prediction of blade transient phenomena is becoming more and more important to turbomachinery designers because the continuing need to gain performance improvements makes it necessary to operate closer to performance envelopes. Traditional full-wheel transient solutions provide high levels of accuracy but are computationally expensive because they require simulating many or all blade passages in a given blade-row. Pitch-change methods reduce the problem to a small sector of the geometry but still require the simulation of many vibration cycles to reach a quasi-steady periodic state. The HA method in Ansys 19.0 helps overcome this challenge by solving multistage transient blade row problems by calculating as few as one blade per row, reducing the computational time by a factor of 100 compared to a full wheel solution and by a factor of 25 compared to the FT method, the previous state-of-the-art for this type of problem.
June 10, 2020

Virtual Prototyping for the Blow Molding Industry – Application Brief

It has taken nearly 20 years to fine-tune milk jugs and soda bottles to achieve their current weights. But the plastics and beverage industries expect that new designs hit the market as already downgauged. This can be achieved only via continuous innovation throughout the entire blow molding process, even including research in the material science phase. This paper describes how the process of virtual prototyping in blow molding can be a very effective tool to ensure that new bottle designs achieve the objective of weight reduction while still fulfilling function.
June 10, 2020

Accurate Combustion Chemistry is Crucial to Engine Design – Application Brief

Designing new, high-efficiency, low-emissions IC engines presents technical challenges that are often dominated by the chemical kinetics that occur during combustion. Consequently, simulations of combustion for enhanced engine designs need good fuel-combustion chemistry. Modeling and simulation practices that were good enough for the design of yesterday's engines are insufficient for today's engines. Using old practices, the automotive industry often finds that combustion CFD is unable to predict values or even accurate trends in critical combustion behaviors such as ignition, flame propagation, and emissions. This makes it tough to use simulation effectively to address the increased complexities in efficiency and emissions prediction.
June 10, 2020

Overset Mesh Can Simplify and Speed Simulations with Moving Parts – Application Brief

A common difficulty in simulating complex fluid flow problems is that some geometries can not be well-represented using a single, continuous mesh. In many cases, different geometrical features are best represented by different mesh types. Preparing this mesh can be time-consuming and complicated. Additionally, the large, poorly structured meshes that result can take excessive time to solve and can result in reduced accuracy.
May 14, 2020

Overset Mesh Can Simplify and Speed Simulations with Moving Parts – Application Brief

A common difficulty in simulating complex fluid flow problems is that some geometries can not be well-represented using a single, continuous mesh. In many cases, different geometrical features are best represented by different mesh types. Preparing this mesh can be time-consuming and complicated. Additionally, the large, poorly structured meshes that result can take excessive time to solve and can result in reduced accuracy.
May 8, 2020

Rotating Machinery: A Critical CFD App You Have to Get Right – Application Brief

In today’s globally competitive marketplace, it’s very difficult to imagine developing a competitive rotating machinery product without the benefit of simulation. Many rotating machinery companies were early adopters of simulation and played a significant role in shaping software development to their needs and validating it for their applications. The unequaled depth and unparalleled breadth of the Ansys TurboSystem enable engineers to identify, diagnose, and overcome even the most complex design problems in order to maximize efficiency and other performance parameters. Ansys has developed specialized software with a vast array of physical models that enables engineering teams to predict rotating machinery performance and solve product design challenges faster than ever, with a higher level of confidence. Even the most complex design problems can be illuminated and addressed at an exacting level, enabling engineers to make ongoing improvements that balance efficiency gains with other critical design criteria.
April 27, 2020

Creating and Deploying Vendor 3D Components in Ansys HFSS – Application Brief

ANSYS HFSS provides the capability to utilize ready-made 3D Component models that represent discrete parts or components of a simulation such as an antenna, an RF connector or a surface mount device like a chip capacitor.
April 15, 2020

Using Simulation to Optimize Reacting Flows and Combustion – Application Brief

From automobile engines to gas turbine generators to fab tools, reacting flow and combustion is often the key to energy efficiency, emissions, lifespan, product yield, and other performance parameters. Simulation can help your engineering team look deeper into reacting flow and combustion issues to understand the complex chemical reactions, fluid flow, heat transfer, electrical performance, and other factors that determine the performance of your product. Simulation enables your engineers to evaluate more design alternatives more thoroughly than traditional prototype-based design and development methods.