Numerical simulation of unsteady flows with transient regimes

Pinchukov, V. I.

doi:10.1134/s0965542509100108

Cited by 4 publications

(14 citation statements)

References 2 publications

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“…Reynolds-averaged Navier-Stocks equations added by an algebraic turbulence model are used here and in previous author's investigations [13][14][15][16]. A search for new self-oscillatory flows deals with trial calculations of numerous different flows.…”

Section: Physical and Computational Modelsmentioning

confidence: 99%

“…A jet impinging on a plane [6][7][8][9][10][11][12][13][14] is another type of compressible jet unsteady flows. Self-oscillations main frequencies are studied in [6][7].…”

Section: Introductionmentioning

confidence: 99%

“…Self-oscillations main frequencies are studied in [6][7]. Numerical flow field simulations are carried out in [8][9][10][11][12][13][14]. The numerical approach LES is used in [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

“…Possibility of the disturbances amplification by contact discontinuities is a result of the Kelvin-Helmholtz instability and is accepted. Inclusion of intersection points to a list of amplifiers [13][14] is initiated by the known possibility to operate types of the shock reflection from a plane (Mach or regular type) by small influences. If small influences yield significant change of the flow in the reflection zone, then this flow structure is an amplifier of disturbances.…”

Section: Introductionmentioning

confidence: 99%

“…The numerical approach LES is used in [10][11][12]. RANS, added by an algebraic turbulence model, are used in [13][14]. An impinging of a supersonic underexpanded jet, surrounded by a subsonic stream, on a blunted cone, was found also to have self-oscillatory regimes [15].…”

Section: Introductionmentioning

confidence: 99%

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Numerical Simulations of Self-Oscillatory Flows near Blunted Bodies, Giving off Opposite Jets

Pinchukov

2014

IJMEA

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New self-oscillatory compressible flows are found and investigated. Self-oscillations are supposed to be produced as a result of resonance interactions of flow "active" elements, namely, elements, amplifying disturbances. Hypothesis is used that contact discontinuities and intersection points of shocks with shocks or shocks with contact discontinuities compose the flow set of "active" elements. Two-dimensional Reynolds-averaged Navier-Stocks equations added by an algebraic turbulence model are solved by an implicit third order Runge-Kutta scheme. Well studied open cavity flow and jet impinging on a plane are calculated to verify the numerical method and the turbulence model. Compressible flows near blunted bodies, giving off supersonic opposite jets from forehead surfaces, are discovered to have self-oscillatory regimes.

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Section: Physical and Computational Modelsmentioning

confidence: 99%

“…A jet impinging on a plane [6][7][8][9][10][11][12][13][14] is another type of compressible jet unsteady flows. Self-oscillations main frequencies are studied in [6][7].…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical Simulations of Self-Oscillatory Flows near Blunted Bodies, Giving off Opposite Jets

Pinchukov

2014

IJMEA

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Modeling of self-oscillations and a search for new self-oscillatory flows

Pinchukov

2012

Math Models Comput Simul

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A possible mechanism of self oscillations in flows with shock waves and contact disconti nuities is studied. Flows are investigated in the heliosphere, near a blunt cone in an inhomogeneous stream, and in the vicinity of a blunt cylinder with an outflowing supersonic jet, which is supposed to be, according to this mechanism, of a self oscillatory nature. Two dimensional Reynolds equations with algebraic turbulent viscosity are solved by the implicit third order Runge-Kutta scheme. The results of numerical studies are presented.

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Mathematical Modeling of Plasma Dynamics for Processes in Capillary Discharges

Kuzenov¹,

Ryzhkov²

2019

Nelin. Dinam.

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A statement of the problem is presented and numerical modeling of plasma-gas-dynamic processes in the capillary discharge plume is performed. In the developed model, plasma dynamic processes in a capillary discharge are determined by the intensity, duration of plasma formation processes in the capillary discharge channel, and thermodynamic parameters in the surrounding gaseous medium. The spatial distribution of temperature, density and pressure, radial and longitudinal velocities of pulsed jets of several capillary discharge channels is presented. RUSSIAN JOURNAL OF NONLINEAR DYNAMICS, 2019, 15(4), 543-550 544 V. V. Kuzenov, S. V. Ryzhkov structures (which form near the boundary of a pulsed jet) and a capillary discharge torch in the air atmosphere.When carrying out these calculations, the capillary discharge channel was not considered, and the gas-dynamic parameters flowing into the flooded space of the pulsed plasma jet were estimated as follows. In a first approximation, the mathematical model of plasmodynamic processes inside a channel of a capillary discharge can be constructed from the condition that the energy deposited from a capacitive storage is emitted by an optically dense plasma, and all electrical energy is transferred to the thermal energy of the plasma, which expires with sound velocity through a section of a capillary discharge.Plasma-dynamic processes occurring in a plasma torch of a capillary discharge can be determined using the system of equations of viscous two-temperature radiation plasma dynamics. The numerical method for the equations of plasma dynamics is based on the method of fractional steps. The numerical solution is also described in [3,4].

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Numerical simulation of unsteady flows with transient regimes

Cited by 4 publications

References 2 publications

Numerical Simulations of Self-Oscillatory Flows near Blunted Bodies, Giving off Opposite Jets

Numerical Simulations of Self-Oscillatory Flows near Blunted Bodies, Giving off Opposite Jets

Modeling of self-oscillations and a search for new self-oscillatory flows

Mathematical Modeling of Plasma Dynamics for Processes in Capillary Discharges

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