Flow Analysis of the F-16XL Aircraft at Transonic Flow Conditions

2017 ◽  
Vol 54 (2) ◽  
pp. 388-394
Author(s):  
Okko J. Boelens
Keyword(s):  
Transonic Flow ◽  
Flow Analysis ◽  
Flow Conditions

scholarly journals Axial-flow compressor analysis under distorted phenomena at transonic flow conditions

2018 ◽  
Vol 5 (1) ◽  
pp. 1526458
Author(s):  
G Srinivas ◽  
K Raghunandana ◽  
Shenoy B Satish ◽  
Duc Pham
Keyword(s):  
Transonic Flow ◽  
Axial Flow ◽  
Flow Conditions ◽  
Axial Flow Compressor ◽  
Flow Compressor

Simulations of Transonic Diffuser-Volute System Using Hybrid Unstructured CFD

2000 ◽  
Author(s):  
A. Hosangadi ◽  
V. Ahuja ◽  
Y. T. Lee
Keyword(s):  
Transonic Flow ◽  
Numerical Stability ◽  
Efficient Solution ◽  
Solution Procedure ◽  
Flow Conditions ◽  
Vaneless Diffuser ◽  
Parallel Solution ◽  
Water Region ◽  
Good Comparison ◽  
Comparison With Experimental Data

Abstract Simulations for a vaneless diffuser-volute configuration at transonic flow conditions are presented using a multi-element unstructured CFD code CRUNCH. The unstructured framework permits the generation of a contiguous grid without internal boundaries between the diffuser-volute interface, and also provides good local resolution around the cut-water region. The increased numerical stability resulting from these factors coupled with the parallel solution framework yields an efficient solution procedure. Numerical results indicate good comparison with experimental data for the baseline geometry where the measured performance was below the design prediction.

Unsteady Transonic Flow Analysis for Low Aspect Ratio, Pointed Wings

AIAA Journal ◽  
1974 ◽  
Vol 12 (4) ◽  
pp. 516-522 ◽  
Author(s):  
K. R. KIMBLE ◽  
D. D. LIU ◽  
S. Y. ROU ◽  
J. M. WU
Keyword(s):  
Aspect Ratio ◽  
Transonic Flow ◽  
Flow Analysis ◽  
Low Aspect Ratio

scholarly journals Modeling Physiological Flow in Fontan Models With Four-Dimensional Flow Magnetic Resonance Imaging, Particle Image Velocimetry, and Arterial Spin Labeling

2019 ◽  
Vol 141 (12) ◽  
Author(s):  
David R. Rutkowski ◽  
Rafael Medero ◽  
Timothy A. Ruesink ◽  
Alejandro Roldán-Alzate
Keyword(s):  
Arterial Spin Labeling ◽  
Phase Contrast ◽  
Particle Image ◽  
Flow Analysis ◽  
Patient Specific ◽  
Resonance Imaging ◽  
Flow Conditions ◽  
4D Flow ◽  
Image Velocimetry ◽  
Flow Mri

Abstract The Fontan procedure is a successful palliation for single ventricle defect. Yet, a number of complications still occur in Fontan patients due to abnormal blood flow dynamics, necessitating improved flow analysis and treatment methods. Phase-contrast magnetic resonance imaging (MRI) has emerged as a suitable method for such flow analysis. However, limitations on altering physiological blood flow conditions in the patient while in the MRI bore inhibit experimental investigation of a variety of factors that contribute to impaired cardiovascular health in these patients. Furthermore, resolution and flow regime limitations in phase contrast (PC) MRI pose a challenge for accurate and consistent flow characterization. In this study, patient-specific physical models were created based on nine Fontan geometries and MRI experiments mimicking low- and high-flow conditions, as well as steady and pulsatile flow, were conducted. Additionally, a particle image velocimetry (PIV)-compatible Fontan model was created and flow was analyzed with PIV, arterial spin labeling (ASL), and four-dimensional (4D) flow MRI. Differences, though nonstatistically significant, were observed between flow conditions and between patient-specific models. Large between-model variation supported the need for further improvement for patient-specific modeling on each unique Fontan anatomical configuration. Furthermore, high-resolution PIV and flow-tracking ASL data provided flow information that was not obtainable with 4D flow MRI alone.

scholarly journals Semi-Inverse Method of Computation in Inviscid Transonic Flows: Application to the Design of Turbomachines Blades Profiles

1981 ◽  
Author(s):  
H. Miton
Keyword(s):  
Transonic Flow ◽  
Inverse Method ◽  
Flow Problem ◽  
Order Approximation ◽  
Suction Side ◽  
Computational Technique ◽  
Input Flow ◽  
Flow Conditions ◽  
Transonic Flows ◽  
Channel Type

The present method is based on an original computational technique of quasi two-dimensional inviscid transonic flows but which takes into account the changes of entropy due to shocks. The present approach consists in a numerical 2nd order approximation of the real transonic flow problem (hyperbolic or elliptic) by an initial values problem of hyperbolic and parabolic nature respectively. Such a method applied to the flow field between two adjacent blades profiles allows starting from a prescribed distribution of velocity along blade pressure or suction side to determine the flow details inside this domain and the profile of the opposite blade wall corresponding to input flow conditions which however should be made to satisfy the periodicity conditions as at this stage the approach is of the channel type. Examples of computation for simple cases are shown which proves the validity of the method.

Residence Time in Niches of Stagnant Flow Determines Fibrin Clot Formation in an Arterial Branching Model - Detailed Flow Analysis and Experimental Results

1995 ◽  
Vol 74 (03) ◽  
pp. 916-922 ◽  
Author(s):  
Armin J Reininger ◽  
Cornelia B Reininger ◽  
Ulrich Heinzmann ◽  
Laurenz J Wurzinger
Keyword(s):  
Flow Analysis ◽  
Fibrin Clot ◽  
Clot Formation ◽  
Residence Times ◽  
Flow Conditions ◽  
Shear Rates ◽  
Branching Model ◽  
Convergent Flow ◽  
Branching Flow ◽  
Stagnant Flow

SummaryDeposition of blood components in branching flow has been investigated primarily with regard to platelets. We instead examined thrombin-induced fibrin clot formation in separated laminar as well as turbulent branching flow. The most rapid clot growth and largest clot mass was obtained at the lowest inflow rate. Increased inflow reduced the clot size and turbulence completely prevented clot formation. Examination of corresponding flow conditions revealed the recirculation zone in laminar flow to be characterized by two stationary, counterrotating vortices. Niches of stagnant flow, exhibiting long residence times, low wall shear rates and characterized by convergent flow, were spared between the bulk flow and these vortices. Here, fibrin clot growth continued even when shear rates were increased more than 100-fold. Our results indicate that, in branching flow, the long residence times and convergent flow characteristic of flow niches rather than shear rate are critical for fibrin clot formation.

Inviscid-Viscous Coupled Solution for Unsteady Flows Through Vibrating Blades: Part 2—Computational Results

1993 ◽  
Vol 115 (1) ◽  
pp. 101-109 ◽  
Author(s):  
L. He ◽  
J. D. Denton
Keyword(s):  
Unsteady Flow ◽  
Transonic Flow ◽  
Three Dimensional ◽  
Unsteady Flows ◽  
Computational Results ◽  
Flow Conditions ◽  
Viscous Effects ◽  
Blade Flutter ◽  
Coupled Solution

A quasi-three-dimensional inviscid-viscous coupled approached has been developed for unsteady flows around oscillating blades, as described in Part 1. To validate this method, calculations for several steady and unsteady flow cases with strong inviscid-viscous interactions are performed, and the results are compared with the corresponding experiments. Calculated results for unsteady flows around a biconvex cascade and a fan tip section highlight the necessity of including viscous effects in predictions of turbomachinery blade flutter at transonic flow conditions.

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