Two-dimensional large eddy simulation of a flow experiment intended for studying and understanding transition and parietal vortex shedding has brought to light some interesting features that have never been seen in previous similar simulations and have implications for future computational work on combustion instabilities in rocket motors. The frequency spectrum of pressure at head end shows a peak at the expected value associated with parietal vortex shedding but an additional peak at half this frequency emerges at downstream location. Using vorticity spectra at various distances away from the wall, it is shown that the frequency halving is due to vortex pairing as hypothesized by Dunlap et al. [“Internal flow field studies in a simulated cylindrical port rocket chamber,” J. Propul. Power 6(6), 690–704 (1990)] for a similar experiment. As the flow transitions to turbulence towards the nozzle end, inertial range with Kolmogorov scaling becomes evident in the velocity spectrum. Given that the simulation is two-dimensional, such a scaling could be associated with a reverse energy cascade as per Kraichnan-Leith-Bachelor theory. By filtering the simulated flow field and identifying where the energy backscatters into the filtered scales, the regions with a reverse cascade are identified. The implications of this finding on combustion modeling are discussed.
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July 2017
Research Article|
July 14 2017
Vortex pairing and reverse cascade in a simulated two-dimensional rocket motor-like flow field Available to Purchase
Kalyana Chakravarthy;
Kalyana Chakravarthy
a)
Defence Research and Development Laboratory
, Kanchanbagh, Hyderabad, India
Search for other works by this author on:
Debasis Chakraborty
Debasis Chakraborty
Defence Research and Development Laboratory
, Kanchanbagh, Hyderabad, India
Search for other works by this author on:
Kalyana Chakravarthy
a)
Debasis Chakraborty
Defence Research and Development Laboratory
, Kanchanbagh, Hyderabad, India
a)
Author to whom correspondence should be addressed: [email protected]
Physics of Fluids 29, 075104 (2017)
Article history
Received:
November 24 2016
Accepted:
June 07 2017
Citation
Kalyana Chakravarthy, Debasis Chakraborty; Vortex pairing and reverse cascade in a simulated two-dimensional rocket motor-like flow field. Physics of Fluids 1 July 2017; 29 (7): 075104. https://doi.org/10.1063/1.4989420
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