Among the several noise-generation mechanisms of airfoil self-noise, trailing-edge bluntness noise is an important source, which caused by vortex shedding at blunt trailing edges. A numerical study on control using bio-inspired wavy leading edges presented in this paper. The high-fidelity, improved, delayed, detached eddy simulation (IDDES) method was used to calculate flow field, and acoustic ...

Collective migration of cells in the zebrafish Posterior Lateral Line primordium (PLLp) along a path defined by Cxcl12a expression depends on Cxcr4b receptors in leading cells and on Cxcr7b in trailing cells. Cxcr7b-mediated degradation of Cxcl12a by trailing cells generates a local gradient of Cxcl12a that guides PLLp migration. Agent-based computer models were built to explore how a polarized...

Adaptive morphing trailing edge wings have the potential to reduce the fuel burn of transport aircraft. In this paper, we quantify the aerodynamic performance benefits of a morphing trailing using aerodynamic design optimization. The aerodynamic model solves the Reynolds-averaged Navier– Stokes equations with a Spalart–Allmaras turbulence model. A gradient-based optimization algorithm is used i...

Backtracking search is a well-known problem solving technique, which has proven to be successful in particular for constraint solvers. Traditionally, there are two techniques for backtracking: recomputation with copying and trailing. These approaches are basically dual: upon backtracking, recomputation redoes some steps in the search, while trailing undoes some steps. Both techniques have parti...

Centrifugal Compressors play an essential role in oil, gas and petrochemical industries. Their extensive usage is due to their smooth operation and high reliability compared to other other compressor types. One of the main characteristics of these turbomachines is their performance curve, which is an important criterion for selecting the appropriate compressor for a desired working condition. I...

plicated processes on the wheel surf ace along the wheel width. In order to make these processes clear, the experimental analysis of traverse grinding was conducted by widely changing the speed ratio, Kv, the setting depth of wheel, ‡TMT, and the number of total steps, m, (the ratio of the wheel width over the traverse feed per one revolution of the workpiece). The following results were obtain...

This paper presents the results of a detailed experimental investigation into the effectiveness of sinusoidal leading edge serrations on aerofoils for the reduction of the noise generated by the interaction with turbulent flow. A detailed parametric study is performed to investigate the sensitivity of the noise reductions to the serration amplitude and wavelength. The study is primarily perform...