Views from Intelligent Light
Roger Rintala

NASA CFD Vision 2030 Update

 

Scalable Knowledge Capture is Essential to Avoid CFD Bottlenecks

 

Turbo_Shane2

Image produced by Intelligent Light via XDB’s from an Air Force Research
Laboratory (AFRL) sponsored Phase II SBIR, Contract FA8650-14-C-2439.

NASA’s CFD Vision 2030 Study details the many challenges that remain to routinely obtain accurate physics-based predictions of complex turbulent flows, including how to streamline and automate analysis to gain knowledge. Evolving HPC architectures will produce huge amounts of data, and future CFD technologies must be built to both realize the promise and avoid the pitfalls of this uncertain landscape. At Aviation 2015 this summer, Intelligent Light’s Dr. Earl Duque participated in an expert panel that discussed visions for post-processing and knowledge capture to meet the NASA 2030 CFD goals. Dr. Duque will be the lead author on the summary paper targeted for SciTech 2016.

 

Reduced Order Modeling Identified in the Study as an Enabling Technology

 

Reduced  Order Modeling (ROM) can both compress and summarize, in a physics-oriented way, large unsteady CFD results and experimental data. Dr. Duque’s Applied Research Group at Intelligent Light has been successfully collaborating with BYU in an Air Force Research Laboratory-funded research effort to apply ROMs and Self-Organizing Maps (SOMs) to turbomachinery CFD. This is one example of how a partnership of government, industry and university researchers is working to make NASA’s 2030 CFD vision a reality.

 

 

Related

Roger Rintala

XDBview used as STEM teaching aid for middle schoolers

Considered by many to be the critical element in preparing students to succeed in the modern economy, STEM education is important to you and your children.

 

Darrin Stephens of Applied CCM, uses FieldView XDBview to introduce students to basic aerodynamics comnepts.

Fueling knowledge development and creativity – Using FieldView XDBview, Darrin Stephens of Applied CCM, introduces students to basic aerodynamics concepts.

When his daughter and her classmates wanted to understand aerodynamics, Dr. Darrin Stephens of Applied CCM knew he could bring examples from his work to help.  Dr. Stephens is a FieldView user and is accustomed to showing clients and colleagues characteristics of fluid flows he’s been studying using computational fluid dynamics (CFD).  Using CFD simulation and FieldView gave him a powerful way to help students see what they can’t directly observe, a problem engineers face all the time.

 

 

The students are participating in a human powered vehicle competition.  They recognized that as their vehicle moved faster, the affects of airflow could limit the speed they could attain and maintain.  They asked Dr. Stephens to help them understand some basic aerodynamic concepts.  He responded by bringing real-life CFD solutions to the classroom and sharing those results with XDBview.

“As part of my lesson I used FieldView XDBview (latest version is fantastic by the way!) with the result from my previous V8 super car simulations to help explain & demonstrate drag, induced drag, streamlines etc.” – Darrin Stephens, Applied CCM

 

school-fv-xdbv-car

Air is a unseen force acting on objects in motion. CFD allows students and engineers alike to see airflows and effects they cannot directly observe.

XDBview allowed Dr. Stephens to show moving airflow and explain the impact on a racecar, effects that are similar to what the students would need to consider.  Having used FieldView to post-process his unsteady OpenFOAM simulation solutions,  he created lightweight XDB files and used XDBview to interactively explore the flow solution and explain aerodynamics to the students.  Because the XDBview session was fully interactive, they were free to ask questions and see new representations of the flow field.

 

Fluid flows and aerodynamics surround us but students need some training to look for them and to consider them when pursuing projects like their human powered vehicles.  Demonstrations such as Dr. Stephens’ shared help students see what they normally can’t, understand new phenomena and send them out of class better prepared to become skilled observers of fluid mechanics when they can see its effects during their daily lives.

 

After the demonstration, the students asked for videos they could continue to watch and share with their parents.  The videos on this page show the CFD simulation results from a flow study of a Holden VE Commodore V8 supercar.

 

Darrin Stephens is a founder and managing director of Applied CCM, an engineering software development company with offices in Australia and Canada.

 

Related post: Applied CCM uses OpenFOAM and FieldView for Unsteady Turbulent Flows

 

Roger Rintala

Applied CCM uses OpenFOAM and FieldView for Unsteady Turbulent Flows

Recently posted videos created by Dr. Darrin Stephens of Applied CCM provide an example of how FieldView is used in the day to day work of engineers.  Applied CCM is an engineering software development company with deep expertise in applying OpenFOAM to study fluid mechanics for its clients.  Dr. Stephens uses FieldView to ensure productivity and to clearly present results to his clients.

 

 

These videos (#1 flow over entire car, #2 directly behind car) show basic airflow characteristics around a Holden VE Commodore V8 supercar design. This is part of a set of case studies Applied CCM developed for an SAE World Congress paper in 2014.

 

Rear Iso View with Streamlines

The vehicle’s surface has been colored by the local pressure results (−3000 to 0 m2/s−2) while streamlines show airflow characteristics. FieldView image courtesy of Applied CCM Pty Ltd.

A good video sequence can be a powerful way to show key flow characteristics and patterns but the views and content are fixed when a movie is made.  Applied CCM went a step further and used XDBview to interactively explore datasets.  XDBview users freely change views, look at different scalar values, apply thresholds or add/remove display elements like streamlines.  Having this capability in a free viewer using compact datasets allows Dr. Stephens to share insights with clients or give individuals the ability to freely explore and interact with complex data on their own.

FieldView XDB files are compact, accurate and provide the ability to interrogate even large, time-dependent data on individual computers regardless of location or connectivity.  Dr. Stephens also used XDBview to introduce middle school students to basic aerodynamic behavior  using the Holden VE Commodore V8 supercar models shown in this article.

 

 

Rear isometric view showing the direction the vehicle surface needs to be moved to increase the lift. The vectors are colored by the absolute value of the z component of the shape sensitivity limited to a maximum value of 5. FieldView image courtesy of Applied CCM Pty Ltd.

In this image, displayed vectors show the direction the vehicle surface needs to be moved to increase the lift. The vectors are colored by the absolute value of the z component of the shape sensitivity limited to a maximum value of 5. FieldView image courtesy of Applied CCM Pty Ltd.

The case studies quantified the sensitivity of designs to pronounced features such as areas of large curvature, sudden changes and sharp edges. 

 

 

New equations were developed to preserve time symmetry for turbulent flows.  First published in the SAE paper, the new computational approach was implemented using the OpenFOAM library.

 

 

Related publication

Application of Time Symmetry Preserving Adjoint Solver in External Car Aerodynamics

Jemcov, A., Stephens, D., and Sideroff, C., “Application of Time Symmetry Preserving Adjoint Solver in External Car Aerodynamics”,SAE Technical Paper 2014-01-0412, 2014, doi:10.4271/2014-01-0412

Atsushi Toyoda

Intelligent Light Proudly Supporting Aerospace Fluid Science Summer School 2015 in Japan

Students from all over Japan who are pursuing Masters and Ph. D degrees in fluid dynamics will get together from August 2-4, 2015 at Yugawara, Kanagawa-ken to share their work. Unlike conferences, the purpose of the gathering is to conduct detailed discussions of their work and get advice from the students and professors from outside of their universities.  Intelligent Light will help students to conduct higher level research by supporting this event.

 

Intelligent Lightは2015年航空宇宙流体科学サマースクールを応援します

8月2日から4日に神奈川県湯河原町にて行われる2015年航空宇宙流体科学サマースクールの開催に弊社は協力させて頂きます。本サマースクールは日本国 内の多くの流体を専門とする修士及び博士学生が参加し、自身の研究発表および意見交換を行う場となっています。学生達がよりよい研究をよりよい環境で行え る様、支援する方針です。

 

Yves-Marie Lefebvre

FieldView Patch Release 15.1 Now Available

 

New Surface Flows seeding option, improved readers, growing pathlines and many more improvements

Surface Flows obtained with the new “From File” seeding option

Surface Flows obtained with the new “From File” seeding option

 

The FieldView Development Team has been working hard on great new capabilities for FieldView 16, coming this fall. We’re halfway through our yearly release cycle: the perfect time to step back and package all the new capabilities and improvements already available so you can benefit from them now.

 

Our recently adopted Agile development method allows us to deliver this patch release quickly so we can spend more time working on FieldView 16.  Only some of the files in your FieldView 15 installation will be updated in the process. Our next full installation package will come with FieldView 16, which will be a new major release of the type our users are more familiar with.

 

Highlights of this patch release are:

  • More control over the location of Surface Flow lines with the new “From File” seeding option.
  • 4x faster read times for the AcuSolve Direct Reader.
  • Parallel post-processing and support for FLOW-3D v11 with the FLOW-3D Direct Reader.
  • Animate the full path followed by your particles over time, even in moving grids, with the new “Growing” display type for particles.
  • Save time on particle animation by reading a single time step and animating only your particles with the new “Read as Steady State” option for single-file transient results.
  • Increased maximum parallel partitions count.
  • Changing grid counts in PLOT3D Function files during transient sweep.
  • A more verbose mode for debugging corrupted arbitrary polyhedra from your solver export.
  • And over 20 additional fixes and improvements…

 

Check out the full details in the What’s New in FieldView Patch Release 15.1 document.

 

The FieldView patch release 15.1 is an upgrade to your FieldView 15 installation. It will run with your current FieldView 15 passwords. It is available for download from the FieldView Customer Center.