I was recently awarded the 2015 NASA Early Career Achievement Medal. The official NASA photo was recently released. The medal is for my work in theoretical aeroacoustics and its application to jet noise prediction.
Author Archives: saemiller
Combustion
I have begun a new journey in the field of combustion. Currently I am reviewing flammability limits, heat release, flame extinction, acoustics, etc. There is some limited literature on acoustic waves from combustion. I am hopeful that I might eventually place these papers on a more grounded theoretical basis. Current models in use are mainly …
Impressionist Artist Garden in Norfolk Exhibit
This weekend I was able to visit the Artist’s Garden Exhibit at The Chrysler Museum of Art in Norfolk Virginia. The exhibit is open until early September. Approximately seventy works are on display. This space shows American artists that used gardens essentially as laboratories for their studies in color theory in the impressionist style. Those …
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Lyon Wildflowers
My good friend and colleague Alexandra sent me a picture of wildflowers near Lyon, France. I love wildflowers. Perhaps more interestingly Lyon is the location of the Aeroacoustics conference. I can imagine Camille Pissarro incorporating these into some of his countryside paintings. I think that a visit to the Norfolk Botanical Gardens is in order.
The Local Structure of Turbulence in Incompressible Viscous Fluid for Very Large Reynolds Number
The NASA Library is amazing and provided me with the original in Russian. Kolmogorov, A. N., “The Local Structure of Turbulence in Incompressible Viscous Fluid for Very Large Reynolds Number,” Dokl. Akad. Nauk. SSSR, Vol. 30, 1941, pp. 299–303.
World War Two Airshow at Pongo / Virginia Beach
It is that time of year again where the World War 2 Airshow occurs near Virginia Beach. Myself and some NASA colleauges headed down on the Saturday to watch flights from 1 pm to approximately 4 pm. It was a beautiful and sunny day. The static dispaly was fun also, including the flight line, and …
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Kites at Virginia Beach
The American Kite Associate visited Virginia Beach recently. They had three areas on the beach fenced off. The first was for open flying. Anyone could go and fly a kite. The second was a static display of many different types of kites. I love octopus – and there were many so that made me very …
An Elegant Explanation of the Effect of Wing Sweepback in Delaying the Appearance of Shock Waves
Suppose a cylindrical wing (constant chord, incidence, etc.) is placed in an airstream at an angle of yaw — i.e., it is swept back. Now, even if the local speed of the air on the upper surface of the wing becomes supersonic, a shock wave cannot form there because it would have to be a …
Sonnet to Turbulence by Stanley Corrsin (1920-1986)
Sonnet to TurbulenceStanley Corrsin Shall we compare you to a liminar flow?You are more lovely and more sinuous.Rough winter winds shake branches free of snow,And summer’s plumes churn up in cumulus.How do we perceive you? Let me count the ways.A random vortex field with strain entwined.Fractal? Big and small swirls in the mazeMay give us …
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Mathematical Relationships
I recently gave a talk at the NASA Langley 2015 Technical Working Group. Slides are available on my website under presentations. One interesting slide shows mathematical relationships between acoustic analogy (turbulence as a source of sound) and nonlinear propagation (Burgers’ equation).