Taking Laminar-Turbulent Transition Modeling to the Next Level

Flows around aerodynamic bodies, like aircraft wings, helicopter blades, wind turbines and turbomachinery components develop boundary layers that, to a large extent, define their performance. The boundary layers can either be laminar or turbulent depending on numerous factors, like Reynolds number, freestream turbulence levels and surface roughness, to name a few. Understanding which type of boundary layer is present, and the location of the laminar-to-turbulent transition point under varying operating conditions, is essential for accurate predictions of the performance of aerodynamic devices. Continue reading

Advanced Electric Machine Design with Electromagnetic and CFD Simulations

You may have read a quick blog post at Desktop Engineering about ANSYS’s electric machine simulation capabilities. Here we dive into the technical aspects and implications of thermal simulation for electric machines.

Electric machine geometry with cooling and integrated power electronics.

Electric machine geometry with cooling and integrated power electronics.

Modern electric machines are designed to meet a wide range of applications, all facing a variety of different technical challenges. They are designed to be compact with high power densities, to have integrated power electronics, to be high-speed for higher power density, and to handle harsh environments.

These challenges all have thermal implications that affect the lifetime and performance of the electric machine and power electronics, and must be balanced with cost goals. ANSYS simulation tools, Fluent and Maxwell, can be used to predict the thermal and electromagnetic performance of these systems, and can therefore be used to optimize design choices for both thermal and cost considerations while meeting all application objectives. Continue reading

Aircraft Cabin Airflow: Curbing Disease Spread

For me, science and engineering has always been about designing solutions to the various problems in our everyday lives. When I began doing research in seventh grade, my very first project was a roof that converted the impact energy of precipitation into electricity to help power the home. The following year, I came up with a dynamically supportive knee brace that implements smart fluids to vary the amount of support that patients received, depending on the physical activity. Last year, I created a self-cleaning outdoor garbage bin to tackle the issue of urban sanitation in our neighborhoods.

raymond wang intel science fair winnerYet perhaps, I am best known for my most recent project, which won the 2015 Intel International Science and Engineering Fair, out of 1,700 students nationally selected from 75+ countries. This year, I tackled the issue of airborne pathogen spread in aircraft cabins, generating the industry’s first high fidelity simulations of airflow inside airplane cabins. Using my insights, I engineered economically feasible solutions that altered cabin airflow patterns, creating personalized breathing zones for each individual passenger to effectively curb pathogen inhalation by up to 55 times and improve fresh air inhalation by more than 190%. Continue reading

A Brave New World – What It Will Take to Realize the Hyperloop Dream

Hyperloop – Elon Musk’s project, now venture-capital-backed, to shuttle passengers between cities via tubes at the speed of sound — is shaping up to be to the 21st century what the railroad was to the 19th century.

Both are visionary: one connected the coasts and permitted safe travel across the continent and the other could provide super-fast, efficient commuter passage between major cities. Both were rejected initially as the stuff of fiction: too theoretical to work, too expensive to build. Both were aided by the technology of their day, railways by the might of the industrial revolution, Hyperloop by the computer and simulation technology. And both, when the history of the 21st century finally is written, will be seen as revolutionary turning points in modes of transportation. Continue reading

Computational Fluid Dynamics can be HOT HOT HOT!

computational fluid dynamics combustion LES natural gasLets talk combustion simulation. I know you dear readers, you are smart! So I will not bore you with explaining what combustion is. Rather, I want to give you some fun facts. As you will see, combustion is really everywhere. Continue reading

Champagne for Our Mother’s Day!

This Sunday is Mother’s Day in the U.S. and over 50 other countries around the World. If you forgot or are not sure if it’s this weekend for you, here is list of Mother’s Day dates.

Of course, the person I will think about is my mother, and I while could easily write a blog about her, I am a private person and thought I would instead share with you some stories of other amazing mothers! Continue reading

The World Cup is Already a Success for Brazil!

Tomorrow, December 6, is an important day for many because it’s the final draw that will deliver the verdict on the eight football (soccer) groups that will kick off the 2014 FIFA World Cup — one of the most popular sporting events in the world, surpassed only by the Olympic Games. The 2014 World Cup will take place in Brazil from June 12 to July 1. This year will be special for me because, for the first time since 2002, Belgium has qualified. The team from Belgium includes a large number of players from prestigious European championships, so we have a fair chance to go quite far in the competition.

Whether the Belgian team will be a tough competitor or an easy seed could influence the rest of the World Cup. Unfortunately, it is very unlikely I will be able to support our Belgian Red Devils in person in Brazil next summer. But I’ll feel a part of the event thanks to the remarkable work done under the auspices of NOVACAP, Maruska Holanda and Pedro Almeida performed by Prof. Paulo de Mattos Pimenta and ESSS, the ANSYS channel partner in South America.

The Stadium That Will Host the 2014 World Cup

The National Stadium of Brasilia Mane Garrincha

The National Stadium of Brasilia Mane Garrincha

Because a stadium is usually considered a prestigious landmark that is expected to last for decades, the quality of the design is crucial. The stadium must be able to withstand any situation it might experience during its lifetime such as heavy wind or cheering crowds. Continue reading

Adjoint Solver Methods for CFD Analysis

When I first encountered adjoint methods as a post-doctoral researcher at NASA, I could see that there was enormous potential in this approach. It was only after joining Fluent, and subsequently ANSYS, that the time was right to develop an adjoint solver for anyone using simulation, not just for those using in-house codes. Given that there were many, many users of ANSYS computational fluid dynamics simulation tools, there was a clear opportunity to deploy this technology globally and impact the design process positively for a lot of organizations. This compelled our adjoint solver project team to overcome some of the significant technical challenges in developing this technology. It was a tough road, but the results have made it all worthwhile.

CFDtechtips-racing car

In this example, the adjoint solver indicates how to modify the shape of this Formula 1 aileron to generate maximum down force.

The adjoint solver calculates sensitivity information for a fluid system. The flow problem is solved in the usual manner. Then the user selects some measure of performance of the system as being of particular interest. The drag or downforce on a car and pressure drop in an internal flow system are common examples. The adjoint solver is run in a manner quite similar to the flow solver. A wide variety of sensitivity data is generated, including the sensitivity of the result of interest to the geometric shape of the system. For many people this type of result needs to be seen to be believed, at which point disbelief turns to delight. Continue reading

ANSYS Congratulates the Emirates Team New Zealand

emirates team new zealand

Courtesy Emirates Team New Zealand

ANSYS congratulates Emirates Team New Zealand for winning the Louis Vuitton Cup for the second time!

Never heard of the Louis Vuitton Cup sailing race? You may have heard of the America’s Cup, the oldest active trophy in international sport. If you haven’t, the America’s Cup is a sailing race where a challenger yacht races one-to-one against the current holder of the America’s Cup. The challenger team has earns this position by winning the Louis Vuitton Cup. Continue reading

Wind Sway and the Tokyo ANSYS Convergence Meeting

In June, I had the pleasure and privilege to present at the Tokyo ANSYS Convergence User Group meeting. Presenting highlights of the ANSYS fluid dynamics solution to more than 1,200 attendees was exhilarating! But since many of you may have attended these events, I won’t do a repeat of the presentation here. Instead, i will share my visit to the

Tokyo SkyTree tower, that city’s new TV tower. The old Tokyo Tower was too small to transmit digital TV signals, since many high rises obstructed its line of sight. Therefore, the SkyTree tower was built and measures 634 meters high, which is 301 meters higher than the old Tokyo Tower. It is also the tallest tower in the world and the second tallest structure, just behind the Burj Khalifa.

While visiting, I overheard a couple asking each other if a violent wind could sway the tower. The answer, thanks to clever architecture, is that it will not. (I could have told them this answer, but who would trust me!) How could a 650 meters thin tower not sway in the wind? The answer is in the core design. Continue reading