Preceding treatment All with recurrent colic abdomen pain (some very severe), diarrhea/obstipation, distention, “doughy & dam-board phenomena”, constitutional symptoms, cough and X-ray suggestive lung tuberculosis. Intestinal ultrasound on the tympanic area were normal, but on dullness pain area were: a/hypo-peristaltic, irregular thickening heterogenic hypo-echoic, irregular margin of the wall...

Abstract. We prove that the divergence-free component of the compressible Euler equations with solid-wall boundary condition converges strongly towards the incompressible Euler equations at the same order as the Mach number. General initial data are considered and are not necessarily close to the divergence-free state. Thus, large amplitude of fast oscillations persist and interact through nonl...

In this paper, we use a lattice Boltzmann model (LBM) for simulation of rarefied gas flows in microchannels at high and moderate Knudsen numbers. The lattice Boltzmann method uses D2Q9 lattice structure and BGK collision operator with single relaxation time. The solid wall boundary conditions used in this paper are based on the idea of bounceback of the nonequilibrium part of particle distribut...

Abstract Passive control of turbulent boundary layer (TBL) separation in a channel with adverse pressure gradient (APG) condition towards the outlet is investigated using Reynolds-averaged Navier-Stokes (RANS) methods and Large Eddy simulations (LES) help commercial ANSYS software. Isothermal incompressible flow near-wall area flat plate as well various configurations wavy wall studied. It show...

This study investigates the effects of wall wettability on cavitation bubble collapse using pseudopotential lattice Boltzmann method with an appropriate external force term and contact angle boundary condition. The accuracy proposed numerical approach is verified by simulating a single-bubble near neutral wall. result shows that condition has significant effect forces exerted bubbles. For hydro...

For gas flows in microfluidic configurations, the Knudsen layer close to the wall can comprise a substantial part of the entire flowfield and has a major effect on quantities such as the mass flow rate through micro devices. The Knudsen layer itself is characterized by a highly nonlinear relationship between the viscous stress and the strain rate of the gas, so even if the Navier-Stokes equatio...