The flow past a circular cylinder controlled by Electromagnetic force is calculated by a finite volume method in order to investigate the control effect of the electromagnetic force on the three-dimensional vortical s...
The flow past a circular cylinder controlled by Electromagnetic force is calculated by a finite volume method in order to investigate the control effect of the electromagnetic force on the three-dimensional vortical structures and the dynamics *** Reynolds number considered are from 200 to 1000,during which the wake transition occurs and the three-dimensional flow structures develop.
Propellant could reach a high pressure and temperature situation in a very short time by the use of high voltage pulsed *** sharp depressurization occurs,BLEVE (boiling liquid expanding vapor explosion)happens immedia...
Propellant could reach a high pressure and temperature situation in a very short time by the use of high voltage pulsed *** sharp depressurization occurs,BLEVE (boiling liquid expanding vapor explosion)happens immediately with a violent phase transition.A two-phase flow with high pressure and speed forms and often causes severe *** is also useful in other aspects such as *** numerical simulation of BLEVE for propulsion shows the pressure has a sharp increasing when phase transition *** a two phase mixture flow moves forward with a high speed and compresses the gas in front.
The coplanar waveguide(CPW)structure can support a quasi-TEM (Transverse Electromagnetic)mode of low frequency microwave propagation;meanwhile the Lorentz force could be induced by electric and magnetic fields in the ...
The coplanar waveguide(CPW)structure can support a quasi-TEM (Transverse Electromagnetic)mode of low frequency microwave propagation;meanwhile the Lorentz force could be induced by electric and magnetic fields in the cross ***,the transmission characters of CPW show deeply influence by structure,material,transmission frequency as well as the surrounding medium *** numerical simulation method has been used in this paper to investigate the distributions of electric fields;magnetic fields and Lorentz force around the CPW,immersed in the flow field with vary bulk conductivity.
The underlying mechanisms of the electromagnetic control of cylinder wake are investigated and *** effects of Lorentz force are found to be composed of two parts,one is its direct action on the cylinder(the wall Loren...
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The underlying mechanisms of the electromagnetic control of cylinder wake are investigated and *** effects of Lorentz force are found to be composed of two parts,one is its direct action on the cylinder(the wall Lorentz force)and the other is applied to the fluid(called the field Lorentz force)near the cylinder *** results show that the wall Lorentz force can generate thrust and reduce the drag;the field Lorentz force increases the ***,the cylinder drag is dominated by the wall Lorentz *** addition,the field Lorentz force above the upper surface decreases the lift,while the upper wall Lorentz force increases *** total lift is dominated by the upper wall Lorentz force.
In this paper,the effects of Lorentz force on drag reduction for a circular cylinder have been studied experimentally and *** on its effects on drag reduction,the Lorentz force is found to be classified into two parts...
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In this paper,the effects of Lorentz force on drag reduction for a circular cylinder have been studied experimentally and *** on its effects on drag reduction,the Lorentz force is found to be classified into two parts：one acts directly on the cylinder,named as the wall Lorentz force,and the other called the field Lorentz force acts on the fluid inside the boundary *** wall Lorentz force leads to the generation of a thrust,whereas the field Lorentz force results in drag *** the former dominates the drag variation,the drag would reduce accordingly and even turn into negative （thrust） with the application of Lorentz force.
We investigate the distribution of electromagnetic body force in a fluid boundary layer produced by a coplanar waveguide(CPW)and focus on the fluid dynamic control effects of a *** electromagnetic body force along the...
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We investigate the distribution of electromagnetic body force in a fluid boundary layer produced by a coplanar waveguide(CPW)and focus on the fluid dynamic control effects of a *** electromagnetic body force along the CPW direction can be created by the mutual coupling of landscape orientated electric and magnetic *** CPWs arranged on the rudder's surface,a direct-force-control rudder can be realized by adjusting the microwave *** is also found that a streamwise microwave electromagnetic body force can markedly enhance lift force and suppress rudder vibration,thus improving response time lag ***,navigation stall caused by a large angle of attack can be avoided.
A modified adaptive algebraic reconstruction technique （MAART） with an auto-adjustment relaxation parameter and smoothness regularization is developed to reveal the tomographic reconstruction of H 2 O distribution i...
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A modified adaptive algebraic reconstruction technique （MAART） with an auto-adjustment relaxation parameter and smoothness regularization is developed to reveal the tomographic reconstruction of H 2 O distribution in combustion from incomplete projections. Determinations of relaxation parameter and regularization factor are discussed with regard to the consideration of improvement in reconstruction and reduction of computational burden. A two-wavelength scheme from tunable diode laser absorption measurement, 7444.36 and 7185.59 cm 1 , is used to simplify the nonlinear solution problem for obtaining the tomographic distributions of concentration and temperature simultaneously. Results of calculations demonstrate that MAART can perform the reconstruction results more efficiently with little complex modification and much lower iterations as compared with the traditional algebraic reconstruction technique （ART） or simultaneous iterative reconstruction technique （SIRT） methods. The stability of the algorithm is studied by reconstruction from projections with random noise at different levels to demonstrate the dependence of reconstruction results on precise line-of-sight measurements.
A mean-field lattice boltzmann model was employed to study capillary penetration into *** of different solid-liquid interaction and hence its contact angle were *** of our Lattice Boltzmann simulation are in excellent...
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A mean-field lattice boltzmann model was employed to study capillary penetration into *** of different solid-liquid interaction and hence its contact angle were *** of our Lattice Boltzmann simulation are in excellent agreement with those anticipated from the Washburn equation.
The electro-magnetic control of vortex-induced vibration (VIV) of a circular cylinder is investigated numerically in the exponential-polar coordinates attached on the moving cylinder for Re=150 in the paper. Compared ...
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The electro-magnetic control of vortex-induced vibration (VIV) of a circular cylinder is investigated numerically in the exponential-polar coordinates attached on the moving cylinder for Re=150 in the paper. Compared with the fixed cylinder, the vibration of cylinder leads to the shift of stagnation point, the shear layer strength and the inertial force, which affects the hydrodynamic forces on the cylinder. The effects of the instantaneous wake geometries and the corresponding cylinder motion on the hydrodynamic forces for one entire period of vortex shed are discussed in the drag-lift phase diagram. The Lorentz force for controlling the vibration cylinder is classified into the field Lorentz force and the wall Lorentz force. The field Lorentz force decreases the lift oscillation, and in turn, suppresses the VIV, whereas the wall Lorentz force has no effect on the lift.
Based on the Euler equation, the hybrid Roe/HLL scheme is employed to simulate the oblique detonation waves （ODWs）. Furthermore, ***）＇namic （MHD） control of both stable and unstable ODWs is investigated. It is s...
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Based on the Euler equation, the hybrid Roe/HLL scheme is employed to simulate the oblique detonation waves （ODWs）. Furthermore, ***）＇namic （MHD） control of both stable and unstable ODWs is investigated. It is shown that the stable ODW wave front can be controlled to the desired position under different inflow Mach numbers. However, for an unstable ODW, it is difficult for the MHD control to return the ODW front, but the unstable ODW turns to be stable with the Lorentz force applied in proper direction.
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