TY - GEN
T1 - Numerical investigation of the effects of wall heating and cooling on the nonlinear transition stages for a sharp cone at Mach 6
AU - Herman, Briannah
AU - Hader, Christoph
AU - Fasel, Hermann F.
N1 - Publisher Copyright:
© 2022, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.
PY - 2022
Y1 - 2022
N2 - Direct Numerical Simulations (DNS) were carried out to investigate the effect of wall heating and cooling on the primary and secondary instability regimes for a 7◦ half-angle straight (right) cone at Mach 6 and zero angle of attack. Typical flow conditions of the Boeing/AFOSR Mach 6 Quiet Tunnel (BAM6QT) at Purdue University was used for the numerical investigations. As expected, regarding the primary wall cooling resulted in a destabilization of the second mode and a stabilization of the first mode, while wall heating had the opposite effect. Wall cooling resulted in a slight reduction of the nonlinear primary wave saturation amplitudes. Wall heating changed the saturation behavior significantly. While for the reference (Tw = 300 K) and cooled wall cases the maximum second mode (saturation) amplitude remains nearly constant after saturation onset, the amplitude continued to increase in the heated case, although at a significantly reduced growth rate compared to the linear stage. In addition, grid convergence investigations showed that for a heated wall case a substantially finer grid resolution is required to accurately capture the primary wave (nonlinear) saturation process. The secondary instability investigations indicated that wall cooling results in larger secondary amplification rates.
AB - Direct Numerical Simulations (DNS) were carried out to investigate the effect of wall heating and cooling on the primary and secondary instability regimes for a 7◦ half-angle straight (right) cone at Mach 6 and zero angle of attack. Typical flow conditions of the Boeing/AFOSR Mach 6 Quiet Tunnel (BAM6QT) at Purdue University was used for the numerical investigations. As expected, regarding the primary wall cooling resulted in a destabilization of the second mode and a stabilization of the first mode, while wall heating had the opposite effect. Wall cooling resulted in a slight reduction of the nonlinear primary wave saturation amplitudes. Wall heating changed the saturation behavior significantly. While for the reference (Tw = 300 K) and cooled wall cases the maximum second mode (saturation) amplitude remains nearly constant after saturation onset, the amplitude continued to increase in the heated case, although at a significantly reduced growth rate compared to the linear stage. In addition, grid convergence investigations showed that for a heated wall case a substantially finer grid resolution is required to accurately capture the primary wave (nonlinear) saturation process. The secondary instability investigations indicated that wall cooling results in larger secondary amplification rates.
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U2 - 10.2514/6.2022-0601
DO - 10.2514/6.2022-0601
M3 - Conference contribution
AN - SCOPUS:85123289508
SN - 9781624106316
T3 - AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2022
BT - AIAA SciTech Forum 2022
PB - American Institute of Aeronautics and Astronautics Inc, AIAA
T2 - AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2022
Y2 - 3 January 2022 through 7 January 2022
ER -