Numerical simulation of viscous effects on high enthalpy flow over a double-wedge geometry

A numerical simulation of the interaction between a regular wave and an immersed horizontal cylinder, whose axis is 3-radius deep, perpendicular to the direction of the wave propagation, is presented in this paper. The numerical model uses the semi-implicit two-step Taylor- Galerkin method to integrate Navier-Stokes equations in time and space. Arbitrary lagrangean-eulerian formulation is employed to describe the free surface movement. The free surface elevations near the cylinder and in some gauges along the channel, as well the spectrum distribution, are compared with experimental ones, and good agreement is obtained. The analysis shows that the viscous effects only affect the area that is very close to the cylinder.

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RELAXATION PROCESSES BEHIND THE SHOCK WAVE IN AIR

NONEQUILIBRIUM PROCESSES: RECENT ACCOMPLISHMENTS ◽

10.30826/nepcap9a-4610.30826/nepcap9a-46 ◽

2020 ◽

Author(s):

A. I. Bryzgalov ◽

Keyword(s):

Numerical Simulation ◽

Shock Wave ◽

High Temperature ◽

Space Missions ◽

Relaxation Processes ◽

Flow Conditions ◽

Chemical Nonequilibrium ◽

Atmospheric Entry ◽

Qualitative And Quantitative ◽

High Enthalpy

This work is relevant to numerical simulation of atmospheric entry phase of space missions and in high enthalpy facilities producting flow conditions close to flight conditions. Such flows are featured by low pressure and high temperature, which induces thermal and chemical nonequilibrium, while calculations with equilibrium assumption give both qualitative and quantitative errors.

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High enthalpy double-wedge experiments

10.2514/6.1996-2238 ◽

1996 ◽

Cited By ~ 9

Author(s):

Joseph Olejniczak ◽

Graham Candler ◽

Michael Wright ◽

Hans Hornung ◽

Ivett Leyva

Keyword(s):

Double Wedge ◽

High Enthalpy

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Study of Thermo-Chemical Non-Equilibrium Phenomena behind Strong Shock Waves at Atmospheric Reentry

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.274.13 ◽

2011 ◽

Vol 274 ◽

pp. 13-22 ◽

Cited By ~ 1

Author(s):

R. Allouche ◽

R. Haoui ◽

J.D. Parisse ◽

R. Renane

Keyword(s):

Numerical Simulation ◽

Equilibrium State ◽

Chemical Species ◽

Strong Shock ◽

One Dimensional ◽

Atmospheric Reentry ◽

High Enthalpy ◽

Finite Differences Method ◽

Strong Shock Waves ◽

Non Equilibrium

This work consists of the numerical simulation of high enthalpy flows. The numerical model is governed by Euler equations and supplemented by the equations of the chemical kinetics modeling the phenomena of the chemical air components in a non-equilibrium state. The finite differences method is used for numerical simulations, the phenomena of a hypersonic flow one-dimensional reactive, non-viscous, chemical non-equilibrium is developed taking into account the physicochemical phenomena like the vibration, the dissociation of the diatomic molecules, the ionization of molecules and the formed atoms of chemical species to higher temperatures which appear behind a strong shock detached and evolve according to time in a relaxation range until to reach the equilibrium state. We are interesting in particular on the temperature effect in ionization of the atoms and the molecules.

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