When a blast of icy weather hit a Canadian wind farm two winters ago, its chill lingered a month. The storm covered almost three dozen wind turbines with ice and they had to shut down. โThe cold weather [was] not an issue,โ the farmโs manager Mark Hachey told CBC News. โThey can run in rain, they can run in snow. Itโs when you get an accumulation of ice, much similar to an airplane.โ
Physicist Masako Yamada is on the case. Dr. Yamada and her colleagues at GE labs have been running ice-forming simulations on Titan, the fastest supercomputer in the U.S. located at the Oak Ridge National Laboratory. She says that the process is analogous to โlooking for a needle in a haystack of needles.โ
The team is using the research to develop โice-phobicโ surfaces and ways to prevent ice build up. โI am trying to look for how water transforms into ice,โ says Dr. Yamada, who works at the Advanced Computing Lab at GE Global Research (GRC). โAs computing gets better, it will get closer to real life, closer to nature.โ
GE scientists have been experimenting with ice for more than six decades. (They even created artificial snowfall in upstate New York.) But never on the scale of Dr. Masadaโs work.
She said that she could model water droplets that are 50 nanometers in size, far smaller than actual droplets, over incredibly short fragments of time called femtoseconds. (One femtosecond is to one second is what one second is to 31.7 million years.) โItโs analogous to creating a high-speed video using an atomic microscope,โ Dr. Yamada said. โTitan is one of the few resources in the world that can handle our needs.โ
There are several ways to stop ice from forming: by reducing the โstickinessโ between ice and surfaces, โbouncingโ water droplets before they freeze and delaying the onset of freezing, and lowering the freezing temperature. โWe can see exactly how the water molecules interact with the surfaces,โ Dr. Yamada said. โThis is simply impossible using any physical test. In addition, in the virtual world, the results are not impacted by dirt, defects and other random sources of noise.โ
The research has applications everywhere, from windshields to the perfect ice cream scooper. โWe have observed that certain types of surfaces hinder ice formation, but the exact mechanism was unknown,โ says Rick Arthur, who leads the Advanced Computing Lab at GRC. โWe use simulations as a means to gain insight into the conditions under which ice can be suppressed. Many industrial systems that operate in cold environments stand to benefit from resisting ice including wind turbines and offshore oil and gas drilling and production rigs operating in extremely cold environments.โ
For Dr. Yamada, ice is just the beginning. โIโm hoping HPC (high-performance computing) can someday be used to address corrosion or disease progress, where many moles [a unit of measurement] of molecules need to be monitored over seconds, hours or even years,โ she recently told HPCwire. โWeโre at least 15 orders of magnitude away, so thereโs a lot of opportunity to innovate hardware, acceleration algorithms, data analysis, data transfer and storage.โ
Says Dr. Yamada: โKnowing which tools to use for a given problem is one of the subtleties and skills of being a good computational scientist.โ
For more stories like this, visit GE Reports.