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Acoustic scattering from the rough sea bottom is recognized as a main source in reverberation. Scattering properties from a layered bottom was studied based on finite element model. The scattering strength and scattering loss from an ensemble of rough interface realizations were investigated. It was found that they were dependent on the thickness of sediment and interference is significant in thin...
Cerebrospinal fluid (CSF) is a fluid that circulates throughout the central nervous system. It is located between the brain and skull and protects the brain and spinal cord from trauma brought upon by movement, falls, blows, etc. More importantly, many of neurological diseases have direct contact with cerebrospinal fluid hydrodynamics and ventricular pressure. Therefore, understanding of the CSF hydrodynamics...
If two electrodes are stressed with a high voltage which creates a sufficiently strong electric field between the electrodes, the underwater pulsed discharge will happen. Then a strong shockwave is eradiated from the electrodes. Through focusing, the direction and the sound level can be enhanced obviously. In order to obtain the propagation rule of the focusing shockwave, the finite element model...
The numerical simulation model of mechanical oil expression from vegetable oil was developed. It was solved by using of combining finite difference with finite element. The displacement experiment for extracted sesame was used to validate the model. As an applied example, the predictions of pore-fluid pressure dissipation and distribution were carried out. The predicted values of displacement conformed...
According to the basic idea of fluid-solid coupling theory, combining percolation mechanics with rock-soil mechanics and considering threshold pressure gradient and fluid-solid coupling character of low permeability reservoirs, a numerical model is established, which can describe the fluid-solid coupling character in saturated deformable low permeability reservoirs and can be solved by coupling numerical...
The finite element (FEM) is used to analyze and study uncompressed viscous turbulent jet flow field in nozzles with different diameters. Computation results with FEM are accordant with the information. When the import velocity and the other boundary conditions are identical, the export velocity of small diameter nozzle is larger than that of large diameter nozzle. This paper provides a new method...
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