We present a new continuous adjoint method for Aerodynamic Shape Optimization (ASO) using the Euler equations, which reduces the computational cost of the gradients by reducing the volume integral part of the adjoint gradient formula to a surface integral. The savings are particularly significant for three-dimensional ASO problems on general unstructured and overset meshes. In order to validate...

slope stability analysis is an enduring research topic in the engineering and academic sectors. accurate prediction of the factor of safety (fos) of slopes, their stability, and their performance is not an easy task. in this work, the adaptive neuro-fuzzy inference system (anfis) was utilized to build an estimation model for the prediction of fos. three anfis models were implemented including g...

Active rotor control of helicopters is the future development direction, and active flap (AFC) one most promising technologies. However, numerical simulation an AFC challenging. It necessary to consider fidelity local flow details while dealing with complex shapes motions. Therefore, few simulations field analyses influencing parameters have been conducted. In particular, there a lack aerodynam...

It is critical to estimate the manoeuvring behaviours of ships in waves since it closely associated with navigation safety at sea. This study aims predict wavelength effects on ship using a Computational Fluid Dynamics (CFD) based technique which enables resolving complex interactions between hull, rudder, and propeller waves. An Unsteady Reynolds-Averaged Navier-Stokes (URANS) model well-known...

A computational fluid dynamics (CFD) approach is presented to model the blood flow through the human circulatory system under altered gravity conditions. Models required for CFD simulation relevant to major hemodynamic issues are introduced such as non-Newtonian flow models governed by red blood cells, a model for arterial wall motion due to fluid-wall interactions, a vascular bed model for out...

We present necessary and sufficient conditions for the reducibility of a self-adjoint linear relation in Krein space. Then generalized Nevanlinna function Q represented by A Pontryagin space can be decomposed means reducing subspaces A. The sum two functions $$ {Q}_i\in {N}_{\kappa_i}\left(\mathcal{H}\right) , i = 1, 2, minimally triplets \left({\mathcal{K}}_i,{A}_i,{\Gamma}_i\right) is also st...

The effect of thermophoresis on the impaction particles a cylinder is investigated for different particle sizes, conductivities, temperature gradients and Reynolds numbers between 100 1600. This first such study performed using Direct Numerical Simulations (DNS), where all temporal spatial scales fluid are resolved. Pencil Code, high-order finite difference code with an overset-grid method prec...

In the conventional structure of the wind turbines along with the doubly-fed induction generator (DFIG), the stator is directly connected to the power grid. Therefore, voltage changes in the grid result in severe transient conditions in the stator and rotor. In cases where the changes are severe, the generator will be disconnected from the grid and consequently the grid stability will be attenu...

In this note, we give some estimate of the generalized quadrature formula of Gauss-Jacobi$$underset{a}{overset{a+eta left( b,aright) }{int }}left( x-aright)^{p}left( a+eta left( b,aright) -xright) ^{q}fleft( xright) dx$$in the cases where $f$ and $left| fright| ^{lambda }$ for $lambda >1$, are $s$-preinvex functions in the second sense.