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Shock Wave-Turbulence Interactions.

Grube, Nathan Elias.

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Shock Wave-Turbulence Interactions.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Shock Wave-Turbulence Interactions./
作者:	Grube, Nathan Elias.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2020,
面頁冊數:	358 p.
附註:	Source: Dissertations Abstracts International, Volume: 81-10, Section: B.
Contained By:	Dissertations Abstracts International81-10B.
標題:	Aerospace engineering. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27738586
ISBN:	9798607307462

Shock Wave-Turbulence Interactions.
Grube, Nathan Elias.

Shock Wave-Turbulence Interactions. - Ann Arbor : ProQuest Dissertations & Theses, 2020 - 358 p.

Source: Dissertations Abstracts International, Volume: 81-10, Section: B.

Thesis (Ph.D.)--Princeton University, 2020.

This item must not be sold to any third party vendors.

Canonical shock / isotropic turbulence interactions (SITIs) are studied using direct numerical simulation (DNS) and perturbation analysis. Flow parameters include unprecedentedly high turbulence Mach numbers (Mt <= 0.7) and up to 15% dilatational turbulent kinetic energy (TKE). These extreme conditions necessitate shock-capturing throughout the entire domain and the use of DNS inflow data from auxiliary forced isotropic turbulence simulations.Three aspects of the DNS results are of particular interest: unprecedentedly high streamwise Reynolds stress amplification; mean flows that differ from classical solutions; and Reynolds stress anisotropy opposite to the predictions of linear theory. These DNS results are elucidated by perturbation analyses. In high-Mt flows, both solenoidal and dilatational incident modes are important, but no existing work handles these modes in a convenient, unified way. Therefore, existing inviscid linear interaction analyses (LIAs) are reformulated in a general framework allowing any incident mode type, any inclination angle, and any shock obliquity. Integrated results are presented for isotropic incident fields of turbulence, sound, and entropy spots. LIA remains remarkably accurate (within 10% for TKE amplification) even for the strong turbulence considered here.The new LIA is used as a starting point for second-order "quadratic interaction analysis" (QIA) and viscous LIA. QIA improves the mean predictions of classical theory; viscous LIA offers a possible explanation for a reported failure of single-wave LIA near so-called critical angles. The anomalous post-shock Reynolds stress anisotropy is explained by the lengthscales of emitted vortical waves as a function of angle. The post-shock waves carrying the majority of the streamwise Reynolds stress are of longer wavelength than those carrying the transverse stress. This implies different timescales, with smaller scales losing the "memory" of their initial anisotropy faster than larger scales lose theirs. A model based on this understanding predicts anisotropies close to those observed. Finally, the smoothing effects of shock motion (SM) are combined with QIA to give "SM-QIA" theory. The resulting mean pressure profiles closely match DNS data through the shock and downstream until the effects of nonlinear terms become important; SM-QIA thus provides an analog to the classical Rankine-Hugoniot shock-jump conditions applicable even in turbulent flows.

ISBN: 9798607307462Subjects--Topical Terms:

1002622
Aerospace engineering.
Subjects--Index Terms:

Hypersonic

Shock Wave-Turbulence Interactions.
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245 1 0 $a Shock Wave-Turbulence Interactions.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2020
300 $a 358 p.
500 $a Source: Dissertations Abstracts International, Volume: 81-10, Section: B.
500 $a Advisor: Martin, Maria P.
502 $a Thesis (Ph.D.)--Princeton University, 2020.
506 $a This item must not be sold to any third party vendors.
520 $a Canonical shock / isotropic turbulence interactions (SITIs) are studied using direct numerical simulation (DNS) and perturbation analysis. Flow parameters include unprecedentedly high turbulence Mach numbers (Mt <= 0.7) and up to 15% dilatational turbulent kinetic energy (TKE). These extreme conditions necessitate shock-capturing throughout the entire domain and the use of DNS inflow data from auxiliary forced isotropic turbulence simulations.Three aspects of the DNS results are of particular interest: unprecedentedly high streamwise Reynolds stress amplification; mean flows that differ from classical solutions; and Reynolds stress anisotropy opposite to the predictions of linear theory. These DNS results are elucidated by perturbation analyses. In high-Mt flows, both solenoidal and dilatational incident modes are important, but no existing work handles these modes in a convenient, unified way. Therefore, existing inviscid linear interaction analyses (LIAs) are reformulated in a general framework allowing any incident mode type, any inclination angle, and any shock obliquity. Integrated results are presented for isotropic incident fields of turbulence, sound, and entropy spots. LIA remains remarkably accurate (within 10% for TKE amplification) even for the strong turbulence considered here.The new LIA is used as a starting point for second-order "quadratic interaction analysis" (QIA) and viscous LIA. QIA improves the mean predictions of classical theory; viscous LIA offers a possible explanation for a reported failure of single-wave LIA near so-called critical angles. The anomalous post-shock Reynolds stress anisotropy is explained by the lengthscales of emitted vortical waves as a function of angle. The post-shock waves carrying the majority of the streamwise Reynolds stress are of longer wavelength than those carrying the transverse stress. This implies different timescales, with smaller scales losing the "memory" of their initial anisotropy faster than larger scales lose theirs. A model based on this understanding predicts anisotropies close to those observed. Finally, the smoothing effects of shock motion (SM) are combined with QIA to give "SM-QIA" theory. The resulting mean pressure profiles closely match DNS data through the shock and downstream until the effects of nonlinear terms become important; SM-QIA thus provides an analog to the classical Rankine-Hugoniot shock-jump conditions applicable even in turbulent flows.
590 $a School code: 0181.
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650 4 $a Computational physics. $3 3343998
653 $a Hypersonic
653 $a Interaction
653 $a Shock
653 $a Shockwave
653 $a Supersonic
653 $a Turbulence
690 $a 0538
690 $a 0216
710 2 $a Princeton University. $b Mechanical and Aerospace Engineering. $3 2102828
773 0 $t Dissertations Abstracts International $g 81-10B.
790 $a 0181
791 $a Ph.D.
792 $a 2020
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27738586