Efficient Computation of Unsteady Aerodynamic Loads Using Computational-Fluid-Dynamics Linearized Methods

2013 ◽  
Vol 50 (2) ◽  
pp. 425-440 ◽  
Author(s):  
Dietmar Fleischer ◽  
Christian Breitsamter
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Efficient Computation ◽  
Aerodynamic Loads ◽  
Unsteady Aerodynamic

Aerodynamic Interference Effect of Huge Wind Turbine Blades With Periodic Surge Motions Using Overset Grid-Based Computational Fluid Dynamics Approach

2015 ◽  
Vol 137 (6) ◽  
Author(s):  
Thanh Toan Tran ◽  
Dong-Hyun Kim ◽  
Ba Hieu Nguyen
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Wind Turbine ◽  
Turbine Blades ◽  
Overset Grid ◽  
Wind Turbine Blades ◽  
Unsteady Aerodynamic ◽  
Rotating Blade ◽  
Floating Offshore Wind Turbines ◽  
Grid Based

The accurate prediction of unsteady aerodynamic performance and loads, for floating offshore wind turbines (FOWTs), is still questionable because several conventional methods widely used for this purpose are applied in ways that violate the theoretical assumptions of their original formulation. The major objective of the present study is to investigate the unsteady aerodynamic effects for the rotating blade due to the periodic surge motions of an FOWT. This work was conducted using several numerical approaches, particularly unsteady computational fluid dynamics (CFD) with an overset grid-based approach. The unsteady aerodynamic effects that occur when an FOWT is subjected to the surge motion of its floating support platform is assumed as a sinusoidal function. The present CFD simulation based on an overset grid approach provides a sophisticated numerical model on complex flows around the rotating blades simultaneously having the platform surge motion. In addition, an in-house unsteady blade element momentum (UBEM) and the fast (fatigue, aerodynamic, structure, and turbulence) codes are also applied as conventional approaches. The unsteady aerodynamic performances and loads of the rotating blade are shown to be changed considerably depending on the amplitude and frequency of the platform surge motion. The results for the flow interaction phenomena between the oscillating motions of the rotating wind turbine blades and the generated blade-tip vortices are presented and investigated in detail.

scholarly journals Aerodynamic shape optimization of guided missile based on wind tunnel testing and computational fluid dynamics simulation

2017 ◽  
Vol 21 (3) ◽  
pp. 1543-1554 ◽  
Author(s):  
Goran Ocokoljic ◽  
Bosko Rasuo ◽  
Aleksandar Bengin
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Wind Tunnel ◽  
Dynamics Simulation ◽  
Navier Stokes ◽  
Technical Institute ◽  
Aerodynamic Loads ◽  
Thrust Vector ◽  
Dynamics Simulations ◽  
The Military

This paper presents modification of the existing guided missile which was done by replacing the existing front part with the new five, while the rear part of the missile with rocket motor and missile thrust vector control system remains the same. The shape of all improved front parts is completely different from the original one. Modification was performed based on required aerodynamic coefficients for the existing guided missile. The preliminary aerodynamic configurations of the improved missile front parts were designed based on theoretical and computational fluid dynamics simulations. All aerodynamic configurations were tested in the T-35 wind tunnel at the Military Technical Institute in order to determine the final geometry of the new front parts. The 3-D Reynolds averaged Navier-Stokes numerical simulations were carried out to predict the aerodynamic loads of the missile based on the finite volume method. Experimental results of the axial force, normal force, and pitching moment coefficients are presented. The computational results of the aerodynamic loads of a guided missile model are also given, and agreed well with.

scholarly journals 3D Flow Prediction for high rise structures

2018 ◽  
Vol 7 (2.24) ◽  
pp. 126
Author(s):  
D Leela ◽  
Babu S ◽  
Dasarathy A K ◽  
S Kumar
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Tall Buildings ◽  
Wind Flow ◽  
3D Flow ◽  
Ansys Fluent ◽  
Aerodynamic Loads ◽  
High Rise ◽  
Flow Prediction ◽  
Flow Variables

Structures more than 40 m are usually termed as high rise structures. It is difficult to predict the flow of wind around structures without the use of computational fluid dynamics software or wind tunnel. These high rise structures are subjected to stronger winds that can cause them to sway. So the predictions of aerodynamic loads acting on tall buildings are very important. This study aims to identify the characteristics of wind flow such high rise structures  by predicting flow variables such as pressure, velocity and impacting stress etc using Ansys Fluent 18.1. The main purpose of this project is to find out : pressure around the building and velocity of wind around the building.

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