POF: Compressible Flows http://scitation.aip.org/ POF: Compressible Flows Parametric study of cylindrical converging shock waves generated based on shock dynamics theory http://link.aip.org/link/?PHF/24/026101/1&agg=rss Zhigang Zhai, Ting Si, Xisheng Luo, Jiming Yang, Cangli Liu et al.<br/> In our previous work, the technique of generating cylindrical converging shock waves based on shock dynamics theory was proposed. In the present work, a further study is carried out to assess the influence of several parameters including the converging angle theta, the incident planar shock Mach num ... [Phys. Fluids 24, 026101 (2012)] published Wed Feb 8, 2012. Experimental study of flight effects on screech in underexpanded jets http://link.aip.org/link/?PHF/23/126102/1&agg=rss Benoit Andre, Thomas Castelain, and Christophe Bailly<br/> Flight effects on screech from an underexpanded supersonic jet have been experimentally investigated in a free jet facility. Screech frequency prediction is addressed, and some conclusions about the convection velocity under flight conditions are drawn. An azimuthal near field acoustic antenna is us ... [Phys. Fluids 23, 126102 (2011)] published Fri Dec 30, 2011. Effect of passive porous surface on the trailing-edge noise http://link.aip.org/link/?PHF/23/126101/1&agg=rss Youngmin Bae and Young J. Moon<br/> This study numerically investigates the effect of porous surfaces on the turbulent noise generated by a blunt trailing-edge of a flat plate. The three-dimensional turbulent flow over the flat plate (Re = 1.3 x 10 and M = 0.06) is computed by incompressible large eddy simulation (LES) based on the ... [Phys. Fluids 23, 126101 (2011)] published Wed Dec 7, 2011. Experimental determination of self-similarity constant for converging cylindrical shocks http://link.aip.org/link/?PHF/23/116103/1&agg=rss Malte Kjellander, Nils Tillmark, and Nicholas Apazidis<br/> Guderley's self-similarity solution r = r(1 t/t) for strong converging cylindrical shocks is investigated experimentally for three different gases with adiabatic exponents gamma = 1.13; 1.40; and 1.66 and various values of the initial Mach number. Corresponding values of the similarity exponent alp ... [Phys. Fluids 23, 116103 (2011)] published Tue Nov 22, 2011. Flow structure and acoustics of supersonic jets from conical convergent-divergent nozzles http://link.aip.org/link/?PHF/23/116102/1&agg=rss D. Munday, E. Gutmark, J. Liu, and K. Kailasanath<br/> Conical convergent-divergent (CCD) nozzles represent an important category of supersonic jet-engine nozzles which require variable throat areas and variable exit areas to adapt to a range of operating conditions. CCD nozzles with design Mach numbers of 1.3, 1.5, and 1.65 are examined experimentally ... [Phys. Fluids 23, 116102 (2011)] published Tue Nov 22, 2011. Sensitivity analysis of dense gas flow simulations to thermodynamic uncertainties http://link.aip.org/link/?PHF/23/116101/1&agg=rss Paola Cinnella, Pietro Marco Congedo, Valentino Pediroda, and Lucia Parussini<br/> The paper investigates the sensitivity of numerically computed flow fields to uncertainties in thermodynamic models for complex organic fluids. Precisely, the focus is on the propagation of uncertainties introduced by some popular thermodynamic models to the numerical results of a computational flui ... [Phys. Fluids 23, 116101 (2011)] published Wed Nov 16, 2011. The Q-K model for gas-phase chemical reaction rates http://link.aip.org/link/?PHF/23/106101/1&agg=rss G. A. Bird<br/> The quantum-kinetic, or Q-K, model is based on the quantum vibration model that is employed in the computation of gas flows at the molecular level by the direct simulation Monte Carlo (DSMC) method. The Q-K procedure for dissociation is physically realistic within the context of the vibration model ... [Phys. Fluids 23, 106101 (2011)] published Fri Oct 21, 2011. Electrostrictive fluid pressure from a laser beam http://link.aip.org/link/?PHF/23/096101/1&agg=rss Simen A. Ellingsen and Iver Brevik<br/> Recent times have seen a surge of research activity on systems combining fluid mechanics and electromagnetic fields. In radiation optics, whenever information about the distribution of pressure in a dielectric fluid is required, the contribution from electrostriction becomes important. In the presen ... [Phys. Fluids 23, 096101 (2011)] published Fri Sep 16, 2011. Admissible shock waves and shock-induced phase transitions in a van der Waals fluid http://link.aip.org/link/?PHF/23/086101/1&agg=rss Nanrong Zhao, Andrea Mentrelli, Tommaso Ruggeri, and Masaru Sugiyama<br/> A complete classification of shock waves in a van der Waals fluid is undertaken. This is in order to gain a theoretical understanding of those shock-related phenomena as observed in real fluids which cannot be accounted for by the ideal gas model. These relate to admissibility of rarefaction shock w ... [Phys. Fluids 23, 086101 (2011)] published Wed Aug 10, 2011. A study of planar Richtmyer-Meshkov instability in fluids with Mie-Gruneisen equations of state http://link.aip.org/link/?PHF/23/076101/1&agg=rss G. M. Ward and D. I. Pullin<br/> We present a numerical comparison study of planar Richtmyer-Meshkov instability with the intention of exposing the role of the equation of state. Results for Richtmyer-Meshkov instability in fluids with Mie-Gruneisen equations of state derived from a linear shock-particle speed Hugoniot relationship ... [Phys. Fluids 23, 076101 (2011)] published Fri Jul 15, 2011. Modeling of electronic excitation and radiation in non-continuum hypersonic reentry flows http://link.aip.org/link/?PHF/23/066102/1&agg=rss Zheng Li, Takashi Ozawa, Ilyoup Sohn, and Deborah A. Levin<br/> The modeling of hypersonic radiation in non-equilibrium, non-continuum flows is considered in the framework of the direct simulation Monte Carlo (DSMC) approach. The study explores the influence of electronic states on the flow chemistry and degree of ionization as well as the assumption that the el ... [Phys. Fluids 23, 066102 (2011)] published Thu Jun 23, 2011. Mach 5 bow shock control by a nanosecond pulse surface dielectric barrier discharge http://link.aip.org/link/?PHF/23/066101/1&agg=rss M. Nishihara, K. Takashima, J. W. Rich, and I. V. Adamovich<br/> Bow shock perturbations in a Mach 5 air flow, produced by low-temperature, nanosecond pulse, and surface dielectric barrier discharge (DBD), are detected by phase-locked schlieren imaging. A diffuse nanosecond pulse discharge is generated in a DBD plasma actuator on a surface of a cylinder model pla ... [Phys. Fluids 23, 066101 (2011)] published Fri Jun 17, 2011. Two-dimensional streaming flows in high-intensity discharge lamps http://link.aip.org/link/?PHF/23/056101/1&agg=rss Thomas D. Dreeben and Gregory P. Chini<br/> High-intensity discharge (HID) lamps embody a practical application in which acoustically generated streaming flows are used to significantly improve energy efficiency. Streaming in these lamps is examined using finite-element simulations in conjunction with available experimental results on the bas ... [Phys. Fluids 23, 056101 (2011)] published Thu May 19, 2011. Transverse jet injection into a supersonic turbulent cross-flow http://link.aip.org/link/?PHF/23/046103/1&agg=rss Z. A. Rana, B. Thornber, and D. Drikakis<br/> Jet injection into a supersonic cross-flow is a challenging fluid dynamics problem in the field of aerospace engineering which has applications as part of a rocket thrust vector control system for noise control in cavities and fuel injection in scramjet combustion chambers. Several experimental and ... [Phys. Fluids 23, 046103 (2011)] published Thu Apr 28, 2011. Sound generation due to unsteady motion of a cylinder http://link.aip.org/link/?PHF/23/046102/1&agg=rss Arjun Sharma and Sanjiva K. Lele<br/> A two-dimensional model problem of sound generation due to prescribed unsteady starting and stopping motion of a circular cylinder is studied by the numerical solution of two-dimensional compressible NavierStokes equations. The unsteady flow near the cylinder surface and the sound generation and pro ... [Phys. Fluids 23, 046102 (2011)] published Wed Apr 27, 2011. RichtmyerMeshkov turbulent mixing arising from an inclined material interface with realistic surface perturbations and reshocked flow http://link.aip.org/link/?PHF/23/046101/1&agg=rss M. Hahn, D. Drikakis, D. L. Youngs, and R. J. R. Williams<br/> This paper presents a numerical study of turbulent mixing due to the interaction of a shock wave with an inclined material interface. The interface between the two gases is modeled by geometrical random multimode perturbations represented by different surface perturbation power spectra with the same ... [Phys. Fluids 23, 046101 (2011)] published Tue Apr 26, 2011. Acoustic emissions from convected wave packets http://link.aip.org/link/?PHF/23/026101/1&agg=rss Dominik Obrist<br/> Localized acoustic sources can often be modeled by wave packets. It has been recognized for a long time that the particular structure of these wave packet sources has a strong influence on the character of the acoustic emission to the far field. In the present work, we study the acoustic emission pa ... [Phys. Fluids 23, 026101 (2011)] published Wed Feb 9, 2011. Analytical theory for planar shock focusing through perfect gas lens and shock tube experiment designs http://link.aip.org/link/?PHF/23/016101/1&agg=rss M. Vandenboomgaerde and C. Aymard<br/> In this paper, we present a generalization of the gas lens technique developed by Dimotakis and Samtaney [Planar shock cylindrical focusing by a perfect-gas lens, Phys. Fluids 18, 031705 (2006)]. This technique is devoted to converting a planar shock wave into a cylindrical one through a shaped inte ... [Phys. Fluids 23, 016101 (2011)] published Wed Jan 26, 2011. Rarefaction criterion and non-Fourier heat transfer in hypersonic rarefied flows http://link.aip.org/link/?PHF/22/126103/1&agg=rss Zhihui Wang, Lin Bao, and Binggang Tong<br/> As a hypersonic flow transits from continuous to more and more rarefied, both the bow shock wave and the boundary layer over a leading edge will gradually become thickening, touching, and interlacing with each other, characterizing the evolution of the flow field structure. Correspondingly, an incre ... [Phys. Fluids 22, 126103 (2010)] published Mon Dec 13, 2010. Experimental studies on coaxial vortex loops http://link.aip.org/link/?PHF/22/126102/1&agg=rss R. Mariani and K. Kontis<br/> An experimental study has been conducted on the formation and propagation of coaxial vortex loops using a shock tube facility. The study aimed at evaluating the flow characteristics of pairs of corotating vortex rings that generate the leapfrogging phenomenon. The driver and driven gas of the shock ... [Phys. Fluids 22, 126102 (2010)] published Mon Dec 13, 2010. Characteristics analysis of the one-dimensional pulsating dynamics of chain-branching detonations http://link.aip.org/link/?PHF/22/126101/1&agg=rss C. Leung, M. I. Radulescu, and G. J. Sharpe<br/> The nonlinear pulsating mechanism of one-dimensional detonations was studied numerically using a simple two-step chain-branching model with separate induction and reaction zones. Numerical simulations were performed for a wide range of parameters, which revealed four distinct pulsating regimes class ... [Phys. Fluids 22, 126101 (2010)] published Wed Dec 8, 2010.