Turbulence statistics that are relevant to jet noise modeling but difficult to measure in experiments are computed using a previously validated simulation database of a Mach 0.9 cold jet. Initial focus is on fourth-order statistics that are at the core of acoustic analogy based models built on both the Lilley and Lighthill equations. Common simplifications of fourth-order correlations based on ...

Unsteady flow computations are presented for a Gulfstream aircraft model in landing configuration, i.e., flap deflected 39° and main landing gear deployed. The simulations employ the lattice Boltzmann solver PowerFLOW to simultaneously capture the flow physics and acoustics in the near field. Sound propagation to the far field is obtained using a Ffowcs Williams and Hawkings acoustic analogy ap...

In this paper we propose a new technique for outlines of objects detection. We exploit the set of contours computed using the image analogies principle. A set of artificial patterns are used to locate contours of any query image, each one permits the location of contours corresponding to a specific intensity variation. We studied these contours and a theoretical foundation is proposed to explai...

Synthesizing two images with seamless boundaries, i.e. seamless image cloning, is important and has many useful applications in CG. Previous approaches do not produce realistic results if texture details of the two images are different. We propose a novel texture-aware seamless cloning framework based on separately processing the details and base image colors. The proposed framework provides re...

Early in 1989, the late Marcel Golay derived a theory for turbulent flow capillary gas chromatography. He assumed that the flow pattern under turbulent conditions consists of a turbulent core separated from the tube wall by a very thin laminar flow layer. Further, it was assumed that the viscosity and the diffusion constant are uniform within the turbulent core. The core radius is a fraction p ...

Due to their interesting thermal properties, liquid metals are widely studied for heat transfer applications where large fluxes occur. In the framework of Reynolds-Averaged Navier–Stokes (RANS) approach, Simple Gradient Diffusion Hypothesis (SGDH) and Reynolds Analogy almost universally invoked closure turbulent flux. Even though these assumptions can represent a reasonable compromise in wide r...

A quad inserted into a turbulent boundary layer of a flat plate and its effect on average heat transfer and the friction coefficient is studied. To optimize this effect, the edge sizes and distance of the quad from the flat plate are continually modified. In each case, simultaneously the heat transfer enhancement and reduction in skin friction are analyzed. For optimization, the genetic algorit...

analogy and how to treat it is among the earliest issues in the jurisprudence and principles of legal schools. meanwhile, although in shī‘ism the universal approach in this respect has since long ago been a negative one and it still continues to be so, the important issue that has to be taken into further consideration and more deeply contemplated on despite the theological viewpoints of the ju...

The interaction between corner flow and heat transfer is very common in the internal external of hypersonic vehicle surface, but it not clear how wall thermal boundary condition affects supersonic layer. In present study, Reynolds stress model used to solve Reynolds-averaged Navier–Stokes equations. results show that when symmetrical temperature Tw less than or equal recovery Taw, mean velocity...