Ensight 後處理 技術白皮書

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發佈日期 2010-08-17


Ensight 後處理 技術白皮書

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The following are white papers written by CEI staff detailing advanced EnSight user topics.

spanwiseload-nologoReducing Design Cycle

A specialized car company needed to design both a production version of their new car, as well as a version of the same car for racing applications. In the past, in order to achieve both of these goals, the manufacturer typically had to design the production version of the car first, and then would back out a racing version. This method of car design results in a long lead time, and a delay in the use of the race car version to help promote the new car model. To achieve a racing version of the car at the same time as the production version, the car manufacturer then needed to employ a very short design cycle program. This allowed the manufacturer to develop the racing version of the car shape and layout without impacting the overall schedule of the production version.

 

In order to achieve the very short design cycle for this type of approach, an improved method for designing, analyzing and understanding the car’s aerodynamic performance was needed. To achieve this design goal, computational fluid dynamics (CFD) simulations of the aerodynamic configurations were employed to analyze various design revisions. Ultimately, this reversal of the typical design cycle allows for a quicker design cycle, utilizing more detailed and accurate analysis of the proposed design prior to any manufacturing or testing.  

 

Boundary Layer Extraction White Paper
Boundary Layer (BL) visualization is a unique feature of EnSight, valuable for investigating skin friction drag, wing stall, heat transfer, and high-speed inlet performance. For many years EnSight has provided standard techniques such as: velocity, Cp, density, or Mach number on a clip plane or model surface; or derived variables like total pressure, vorticity, entropy, helicity, etc.; or velocity profiles for BL profile, thickness, or separation; or isosurfaces of total pressure, vorticity, or entropy.

EnSight goes beyond all these by providing: regions of reverse flow, surface restricted traces in the laminar sub layer, lines of BL separation and attachment, shock surfaces and dilatation contours. And finally, for the past 2 years EnSight has incorporated unique calculation based on Abbott and von Doenhoff''''''''s Theory of Wing Sections, classical boundary layer characteristics: thickness, displacement thickness, momentum thickness, shape factor, and skin friction coefficient. Additional BL capabilities are being introduced in late 2005 and early 2006.

Animating and Presenting Simulation Results White Paper
What this Presentation includes:


Animation for Science and Engineering White Paper
Animation brings life to otherwise inanimate objects and in so doing greatly enhances one''''''''s understanding of geometry, motion and transient phenomena. CEI has long recognized the benefits of computer animation for scientists and engineers and has provided a powerful set of capabilities for the creation and display of animations in its products. This article describes these features and how they have been implemented in our products.


Virtual Reality White Paper
From its beginning in 1994, CEI has kept an eye on developments in virtual reality (VR). As 3D tracking devices, input devices, and new display technologies matured, CEI has been at the forefront of integrating VR capabilities into its family of products. This article is a look at VR and how it is being implemented to help CEI customers better analyze, visualize and communicate engineering and scientific results.

Parallel Processing White Paper
Parallel processing for scientific computation is certainly not a new concept. For decades, performance research has focused on reducing the time it takes to execute floating-point and other operations related to solving numerically intensive algorithms used in such fields as structural mechanics and fluid dynamics. Over the last few years, CEI has aggressively expanded that research into the realm of high-end visualization and VR display.

Flow Feature Extraction White Paper
Since introducing flow-feature extraction options in EnSight in the summer of 2000, CEI developers have made numerous improvements. This article deals with how to use EnSight for flow-feature extraction of vortex cores, lines of boundary layer separation and reattachment, and boundary layer characteristics. It also describes the surface-restricted trace feature of EnSight that is often used in conjunction with other flow-feature depictions.

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