scholarly journals High Speed Vehicle Fluid-Structure-Jet Interaction Analysis and Modeling

2017 ◽  
Author(s):  
Ryan Kitson ◽  
Carlos E. Cesnik
Keyword(s):  
High Speed ◽  
Interaction Analysis ◽  
Fluid Structure ◽  
Jet Interaction ◽  
High Speed Vehicle

scholarly journals FSI(Fluid-Structure Interaction) Analysis for Harmonious Operation of High-Speed Printing Machine

2008 ◽  
Vol 9 (1) ◽  
pp. 137-146 ◽  
Author(s):  
Jin-Ho Kim ◽  
Jae-Woo Lee ◽  
Soo-Hyung Park ◽  
Do-Young Byun ◽  
Yung-Hwan Byun ◽  
...  
Keyword(s):  
High Speed ◽  
Interaction Analysis ◽  
Fluid Structure Interaction ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Printing Machine

Fluid-Structure Interaction Analysis of the Adaptive Finger Seal Assembly Using CFD-ACE+/FemStress

2003 ◽  
Author(s):  
Vladimir Kudriavtsev ◽  
M. Jack Braun ◽  
Robert C. Hendricks
Keyword(s):  
High Speed ◽  
Interaction Analysis ◽  
Pressure Fluctuations ◽  
Low Pressure ◽  
Radial Clearance ◽  
Pressure Side ◽  
Rotating Shaft ◽  
Fluid Structure ◽  
Staggered Arrangement ◽  
Stiffness Characteristics

This paper presents base approach and methodology for computational fluid dynamics (CFD) analysis of adaptive finger seals. Finger seals can be utilized to separate high (HP) and low pressure (LP) zones in high speed rotating shaft environment. Seal reduces axial leakage and typically consists of first and second rows of bristles (sticks), which are packed in the staggered arrangement. First row faces high pressure side and second row faces low pressure side. First row of sticks is used to close circumferential gaps between the bristles of the second row, thus forming air tight package. Second row sticks are made with pads, which ride on the thin layer of film and are (in theory) capable of adjusting radial clearance (film thickness) in response to shaft radial movements or to axial pressure fluctuations. Seal adaptivity will depend on its solid structural stiffness, and on fluid film damping and stiffness characteristics. These characteristics are calculated implicitly during the coupled FSI (fluid-structure interactions) simulations.

scholarly journals Cross-Flow Tidal Turbines with Highly Flexible Blades—Experimental Flow Field Investigations at Strong Fluid–Structure Interactions

Energies ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 797
Author(s):  
Stefan Hoerner ◽  
Iring Kösters ◽  
Laure Vignal ◽  
Olivier Cleynen ◽  
Shokoofeh Abbaszadeh ◽  
...  
Keyword(s):  
Flow Field ◽  
High Speed ◽  
Cross Flow ◽  
Speed Ratio ◽  
Fluid Structure Interactions ◽  
Dimensional Parameter ◽  
Fluid Structure ◽  
Passive Flow Control ◽  
Tidal Turbines ◽  
Tidal Turbine

Oscillating hydrofoils were installed in a water tunnel as a surrogate model for a hydrokinetic cross-flow tidal turbine, enabling the study of the effect of flexible blades on the performance of those devices with high ecological potential. The study focuses on a single tip-speed ratio (equal to 2), the key non-dimensional parameter describing the operating point, and solidity (equal to 1.5), quantifying the robustness of the turbine shape. Both parameters are standard values for cross-flow tidal turbines. Those lead to highly dynamic characteristics in the flow field dominated by dynamic stall. The flow field is investigated at the blade level using high-speed particle image velocimetry measurements. Strong fluid–structure interactions lead to significant structural deformations and highly modified flow fields. The flexibility of the blades is shown to significantly reduce the duration of the periodic stall regime; this observation is achieved through systematic comparison of the flow field, with a quantitative evaluation of the degree of chaotic changes in the wake. In this manner, the study provides insights into the mechanisms of the passive flow control achieved through blade flexibility in cross-flow turbines.

Running safety evaluation of a 350 km/h high-speed freight train negotiating a curve based on the arbitrary Lagrangian-Eulerian method

2021 ◽  
pp. 095440972098628
Author(s):  
Gongxun Deng ◽  
Yong Peng ◽  
Chunguang Yan ◽  
Boge Wen
Keyword(s):  
High Speed ◽  
Safety Evaluation ◽  
Interaction Model ◽  
Arbitrary Lagrangian Eulerian ◽  
Railway Transportation ◽  
Freight Train ◽  
Fluid Structure ◽  
Running Safety ◽  
Study Results ◽  
Fill Level

To adapt to the rapid growth of the logistics market and further improve the competitiveness of railway transportation, the high-speed freight train with a design speed of 350 km/h is being developed in China. The safety of the train under great axle load of 17 t and dynamic load is unknown. This paper is aimed to study the running safety of the high-speed freight train coupled with various cargo loading conditions negotiating a sharp curve at high velocity. A numerical model integrated a fluid-structure coupled container model and the nonlinear high-speed freight train was set up by the software of LS-DYNA. The fluid-structure interaction model between the container and fluid cargo was established using the Arbitrary Lagrangian-Eulerian (ALE) method. Two influencing parameters, including the cargo state in the container and the fill level, were selected. The study results showed that the wheelset unloading ratio and overturning coefficient could be significantly affected by the liquid sloshing, while the influence of sloshing on the risk of derailment was slight. In general, increasing the cargo filling rate would contribute to vehicle operation safety. In conclusion, this study would provide theoretical help for the running safety of the newly designed high-speed freight train.

Sign in / Sign up

Export Citation Format

Share Document