%0 Conference Paper %1 balakumar2014effects %A Balakumar, P. %A King, Rudolph A. %A Eppink, Jenna L. %B 44th AIAA Fluid Dynamics Conference %D 2014 %K 76d10-boundary-layer 76e09-stability-and-instability-of-nonparallel-flows 76j20-supersonic-flows %N AIAA 2014-2639 %R 10.2514/6.2014-2639 %T Effects of Forward- and Backward-Facing Steps on the Crossflow Receptivity and Stability in Supersonic Boundary Layers %U https://arc.aiaa.org/doi/10.2514/6.2014-2639 %X The effects of forward- and backward-facing steps on the receptivity and stability of three-dimensional supersonic boundary layers over a swept wing with a blunt leading edge are numerically investigated for a freestream Mach number of 3 and a sweep angle of 30 degrees. The flow fields are obtained by solving the full Navier-Stokes equations. The evolution of instability waves generated by surface roughness is simulated with and without the forward- and backward-facing steps. The separation bubble lengths are about 5-10 step heights for the forward-facing step and are about 10 for the backward-facing step. The linear stability calculations show very strong instability in the separated region with a large frequency domain. The simulation results show that the presence of backward-facing steps decreases the amplitude of the stationary crossflow vortices with longer spanwise wavelengths by about fifty percent and the presence of forward-facing steps does not modify the amplitudes noticeably across the steps. The waves with the shorter wavelengths grow substantially downstream of the step in agreement with the linear stability prediction.

@inproceedings{balakumar2014effects, abstract = {The effects of forward- and backward-facing steps on the receptivity and stability of three-dimensional supersonic boundary layers over a swept wing with a blunt leading edge are numerically investigated for a freestream Mach number of 3 and a sweep angle of 30 degrees. The flow fields are obtained by solving the full Navier-Stokes equations. The evolution of instability waves generated by surface roughness is simulated with and without the forward- and backward-facing steps. The separation bubble lengths are about 5-10 step heights for the forward-facing step and are about 10 for the backward-facing step. The linear stability calculations show very strong instability in the separated region with a large frequency domain. The simulation results show that the presence of backward-facing steps decreases the amplitude of the stationary crossflow vortices with longer spanwise wavelengths by about fifty percent and the presence of forward-facing steps does not modify the amplitudes noticeably across the steps. The waves with the shorter wavelengths grow substantially downstream of the step in agreement with the linear stability prediction. }, added-at = {2021-08-19T02:23:33.000+0200}, author = {Balakumar, P. and King, Rudolph A. and Eppink, Jenna L.}, biburl = {https://www.bibsonomy.org/bibtex/2e4a011d9c67d50aa15dbd4a982ca3ef2/gdmcbain}, booktitle = {44th AIAA Fluid Dynamics Conference}, doi = {10.2514/6.2014-2639}, eventdate = {June 16-20, 2014}, eventtitle = {AIAA Fluid Dynamics Conference}, interhash = {635e453ae6fdaf9a3cc88ea73b8f88b0}, intrahash = {e4a011d9c67d50aa15dbd4a982ca3ef2}, keywords = {76d10-boundary-layer 76e09-stability-and-instability-of-nonparallel-flows 76j20-supersonic-flows}, number = {AIAA 2014-2639}, organization = {AIAA}, series = {AIAA Fluid Dynamics Conference}, timestamp = {2021-08-19T02:39:52.000+0200}, title = {Effects of Forward- and Backward-Facing Steps on the Crossflow Receptivity and Stability in Supersonic Boundary Layers}, url = {https://arc.aiaa.org/doi/10.2514/6.2014-2639}, venue = {, Atlanta, Georgia}, year = 2014 }