Engineering problems can be quite straight forward when confined to a single size scale. For example, designing an elephant-proof fence is simply an exercise welding together enough big steel bars. But what if it also has to confine mice? By mixing the very large and very small size scales, the mouse introduces a whole new set of problems that will greatly complicate the design and construction of the fence. Tiny gaps irrelevant to the elephant can be escape ways for the mouse!
In early January, I spent two jam packed days in a room with over 60 of our best and brightest to exchange CFD best practices and learn what’s new for fluid dynamics in ANSYS 19.0. These are ANSYS Customer Excellence (ACE) team CFD engineers who work with you, our customers, to set up and solve the toughest simulation problems. In prior years, the presentations have focused on the latest physical models and capabilities. Certainly, those were represented. But this fluid dynamics technical meeting was predominantly about you, the engineer — discussing how to reduce risk to provide the answers you need with the minimum investment of time and resources.
The ANSYS Fluids Team
During the autumn of 1947, the sleek orange form of the Bell X-1 “Glamorous Glennis” dropped clear of its B-29 mothership and lit its four chambered XLR-11 rocket engine. The flight that followed marked a milestone in aviation history as the X-1 and pilot, Charles “Chuck” Yeager successfully completed the first controlled supersonic flight.
The lives of many pilots had been claimed during World War II by the little understood effects of compressibility on an aircraft as it approached the speed of sound and the X-1 was built for the purpose of investigating this flight regime. With only a vague idea of what to expect, the X-1 test pilots and engineers bravely pushed the speed limit leading to the momentous flight on 14th October 1947. Continue reading
I was recently presented with a unique opportunity to compare the results of full ANSYS CFD simulations with the results obtained using the new ANSYS Discovery Live product, which provides results instantly upon changing the geometry without interrupting a run. I was very pleased and surprised by the speed and accuracy of Discovery Live in this comparison test.
I work for Astec, Inc., the subsidiary of Astec Industries that builds asphalt plants. Roadtec Inc., another Astec Industries company, builds asphalt pavers, reclaimers and material transfer vehicles (MTVs). An MTV helps to accomplish non-stop, non-contact paving by offering a continuous supply of Hot Mix to the paver. By separating dump trucks from the paver this way, contractors are able to make a smoother finished road.
In ANSYS AIM 18.2, several improvements have been introduced to the capabilities for simulating fluids. In this blog, I’ll highlight two of what I think are the most significant.
First: time-dependent fluid flow (including solid-fluid heat transfer). Time-dependent fluid flow enables the modelling of both applied physics conditions that change over time, and unsteady flow phenomena, for example varying inlet velocity and/or temperature in an internal pipe flow simulation; or vortex shedding from external flow around a cylinder, such as a chimney.
Second: particle injection (also known as discrete phase modelling, or DPM for short), where the injected particle could be a droplet, for example, a fire sprinkler system spraying water into air, or raindrops, but it could also be a bubble of gas into a fluid. Continue reading
In the world of stock-car racing, finding even the smallest competitive advantage is the difference between winning and losing.
That’s why at Richard Childress Racing, we design and build our race cars end-to-end. We engineer and machine our own chassis and suspension components, we design and fabricate our own bodies, and we test and build our own engines. Everything is built from the ground up at RCR.
Smoking meat (and other food) in a barbecue smoker doesn’t sound complicated, but there are more factors at work in producing delicious food than you would expect. Barbecue enthusiast Travis Jacobs, president of Jacobs Analytics, was aware that in windy conditions the air flow through the bottom inlets and the top outlet vents of a smoker can be variable, leading to internal temperature gradients and swirling air that removes smoke and makes a less savory product. He wanted to make a smoker that could smoke food to perfection in any conditions. Unlike most of us non-engineer weekend barbecuers, he turned to computational fluid dynamics (CFD) simulations to solve this problem.
LEDs are increasingly used in automobile headlights because of their small size and reduced energy consumption. But, though they are much more energy efficient than traditional headlights, most of the energy required is converted to heat rather than light — 70 percent, in fact. This presents a challenge to engineers and designers because, since they are semiconductor-based, the diode junction of LEDs must be kept below 120 C. Maintaining temperature below this limit typically involves cooling airflow from an electric fan combined with heat sink fins.
EnSight, the leading post-processor for Computational Fluid Dynamics (CFD) data is now part of ANSYS. In the two decades since its launch, EnSight has taken off like a multistage rocket. Here is the story.
I grew up in that magical era when NASA used multi-stage rockets to carry Apollo astronauts to the moon and back. As a toddler I learned to count backwards from 10, 9, 8, 7, 6 … because that’s what I heard Mission Control say. I dreamt of being an astronaut, studied aerospace engineering and started my career at NASA’s Johnson Space Center in Houston, Texas. I met my lovely wife there, blocks from the NASA gates. Her parents still live next door to Buzz Aldrin’s Apollo era house. I used to store my lunch in the Mission Control fridge while working on my space shuttle aerodynamic simulations in the support room next door. So maybe it’s natural for me to think in rocket terms. Continue reading
Nuclear power is a key player in the future of clean energy, and multiple companies are pursuing new technologies to maximize nuclear’s contribution to the clean energy space. Founded in 2011 and based in Cambridge, MA, Transatomic Power is an advanced nuclear technology startup developing and commercializing a molten salt reactor (MSR), or a nuclear reactor whose fuel is in liquid, rather than solid, form. This technology, originally developed at the Oak Ridge National Laboratory (ORNL) in the 1960’s, offers multiple safety and cost benefits over traditional nuclear reactors, in which the fuel is in the form of solid pellets cooled by water.
Tranatomic’s MSR design builds on the original work at ORNL and adds a few innovative new features that reduce the reactor’s size and, as a result, it’s cost – a huge factor in building new nuclear power plants. Though the development process is a long one, the world needs a larger capacity for clean energy generation, and it’s this ultimate goal that drives the Transatomic team forward. Continue reading