A new computational capability under development for accurate and efficient high-fidelity direct numerical simulation (DNS) and large eddy simulation (LES) of turbomachinery is described. This capability is based on an entropy-stable Discontinuous-Galerkin spectral-element approach that extends to arbitrarily high orders of spatial and temporal accuracy and is implemented in a computationally e...

Turbodrill is a type of hydraulic axial turbomachinery which has a multistage blade consisting of stators and rotors. In this paper, a turbodrill blade that can be applied in crystallized section under high temperature and pressure conditions is developed. On the basis of Euler equations, the law of energy transfer is analyzed and the output characteristics of turbodrill blade are proposed. Mor...

Oil-free micro turbomachinery implementing gas foil bearings (GFBs) has improved mechanical efficiency and reliability. Adequate thermal management for operation in high temperature environments is an issue of importance in applications such as in gas turbines and turbochargers. GFBs often need a cooling gas flow, axially fed through one end of the bearings, to transport the heat conducted from...

Excessive vibration of turbomachinery blades causes high cycle fatigue (HCF) problems requiring damping treatments to mitigate vibration levels. Based on the technical challenges and requirements learned from previous turbomachinery blade research, a feasibility study of resonant damping control using shunted piezoelectric patches with passive and active control techniques has been conducted on...

This paper describes the development of a computational method to solve the equations of fluid flow across a turbomachinery blade row. The work was done within the Numerical Propulsion System Simulation (NPSS) computational framework and results in a collection of objects which use an implicit formulation of the turbomachinery equations to solve for the fluid exit conditions across each blade r...

In today's CFD-assisted turbomachinery design, a primary objective is to minimize the effects of vortices. Their automatic identification, along with other flow structures, in numerical data is a current research topic. This paper presents a novel method to find vortex hulls in turbomachinery flows automatically. Based on a vortex core line that is the centerline of the vortex, the method is ab...

Turbomachinery from a life cycle perspective involves sustainability-oriented development activities such as design, production, and operation. Digital Twin is technology with great potential for improving turbomachinery, which has high volume of investment long lifespan. This study presents general framework different digital twin enabling technologies the turbomachinery cycle, including desig...

A harmonic balance technique for modeling unsteady nonlinear  ows in turbomachinery is presented. The analysis exploits the fact that many unsteady  ows of interest in turbomachinery are periodic in time. Thus, the unsteady  ow conservation variables may be represented by a Fourier series in time with spatially varying coefŽ cients. This assumption leads to a harmonic balance form of the Eul...

aim and backgruond: blood pressure  , one of the most important public health problem in the world is the main risk factors for heart disease .depression is the common comorbod psychiatric disorder among patient with medicin  conditions .this aim was to    compared   depression between   patients with hypertension and  normal  people . methods and materials: in the case-control ,143 consecative...

Abstract Turbomachinery blade rows can have non-uniform geometries due to design intent, manufacture errors or wear. When predictions are sought for the effect of such non-uniformities, it is generally case that whole assembly calculations needed. A spectral method used in this paper approximate flow fields but with significantly less computation cost. The projects perturbations geometry non-un...