Abstract
In the present paper an experimental and a numerical simulation of the turbulent flow in an in-line tube bundles have been performed. The experiments were carried out using a subsonic wind tunnel. The pressure distributions along the tubes (22 circumferential pressure taping) were determined for a variation of the azimuthal angle from 0 to 360deg. The drag and lift forces are measured using the TE 44 balance. The Navier-Stokes equations of the turbulent flow are solved using Reynolds Stress and K-e, turbulence models (RANS) provided by Fluent CFD code. An adapted grid using static pressure, pressure coefficient and velocity gradient, furthermore, a second order upwind scheme were used. The obtained results from the experimental and numerical studies show a satisfactory agreement.
Highlights
INTRODUCTIONEPJ Web of Conferences switches intermittently from being directed towards one cylinder to the other
It was observed that for the single flexible tube configuration fluid elastic instability was achieved at 25% higher flow velocity and symmetric vortex shedding occurred at 50% higher flow velocities
The interesting thing is that the study tries to explain a lot of unanswered questions regarding tube bundles. Questions such as what is the sufficient domain size needed for a numerical simulation? What is the flow transition Reynolds number from 2D to 3-D? What is the effect of gap spacing on flow behavior? In Moulinec et al the time discretization was performed by Adams-Bashforth scheme and spatial discretization were performed using second order central differencing scheme
Summary
EPJ Web of Conferences switches intermittently from being directed towards one cylinder to the other They concluded that this flow behavior is independent of Reynolds number and purely dependent upon the T / D ratio. Traub [7] conducts open wind tunnel experiments to study the influence of turbulence intensity on pressure drop in in-line and staggered tube bundles at various Reynolds numbers. It is concluded from this study that as the Reynolds number becomes very high the recirculation region shrinks due to shifting of the point of flow separation Due to this shifting, the pressure drop decreases and the drag coefficient decreases. Experimental investigation of turbulent flow in an in-line tube bundle were performed in wind tunnel, using flow control by adding grooves to the cylinders and simulated numerically by using the code ANSYS Fluent
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