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Keywords: turbulence
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Journal Articles
Article Type: Research Papers
J. Pressure Vessel Technol. February 2012, 134(1): 011301.
Published Online: December 1, 2011
...-year lifetime. In particular, the tests will address issues related to in- and out-of-plane fluidelastic instability and random turbulent excitation of a U-tube bundle with AVB supports. Therefore, the measurements include tube vibration amplitudes and frequencies, work-rate due to impacting...
Journal Articles
Article Type: Research Papers
J. Pressure Vessel Technol. October 2011, 133(5): 051301.
Published Online: July 11, 2011
... numerical analysis pipe flow pipes telemetry turbulence vibrations Flow-induced vibrations of heat-exchanger tube bundles and nuclear fuel rods are a major source of concern, when component life and plant availability are addressed. Excitation by the flow turbulence and possible fluid-elastic...
Journal Articles
Article Type: Research Papers
J. Pressure Vessel Technol. October 2010, 132(5): 051302.
Published Online: August 31, 2010
... and the turbulence produced by the flow moving over the fins. The resulting flow pattern/distribution due to the fins is, therefore, more complex than in bare tube arrays. Previous research has shown that an effective diameter of a finned tube is useful in the prediction of vortex shedding. This concept is used...
Journal Articles
Article Type: Research Papers
J. Pressure Vessel Technol. August 2010, 132(4): 041307.
Published Online: July 29, 2010
... of the unsteady flow model (UFM) with computational fluid dynamics (CFD). The CFD model employed solves the Reynolds averaged Navier–Stokes equations for unsteady turbulent flow and is cast in an arbitrary Lagrangian–Eulerian form to handle any motion associated with tubes. The CFD solution provides time domain...
Journal Articles
Article Type: Research Papers
J. Pressure Vessel Technol. August 2010, 132(4): 041302.
Published Online: July 21, 2010
...Marwan Hassan; Achraf Hossen This paper presents simulations of a loosely supported cantilever tube subjected to turbulence and fluidelastic instability forces. Several time domain fluid force models are presented to simulate the damping-controlled fluidelastic instability mechanism in tube arrays...
Journal Articles
Article Type: Research Papers
J. Pressure Vessel Technol. June 2010, 132(3): 031301.
Published Online: May 5, 2010
... turbulence vortices wakes Noise generated by aircraft during take-off and landing is becoming an ever increasing problem due to stricter noise regulations. Recent success in aero-engine noise reduction has led to an increased interest in the noise generated by the aircraft undercarriage, where much...
Journal Articles
Article Type: Research Papers
J. Pressure Vessel Technol. June 2010, 132(3): 031801.
Published Online: May 5, 2010
... the system is excited by an unknown distributed turbulence force field. The extensive identification results presented are based on realistic numerical simulations of gap-supported tubes subjected to flow turbulence excitation. We can thus confront the identified dynamical support contact forces...
Journal Articles
Article Type: Design Innovations
J. Pressure Vessel Technol. February 2010, 132(1): 015001.
Published Online: January 5, 2010
... of the shear layer at the mouth of the side branch. Because these design charts are developed from tests of cylindrical pipes conveying turbulent flow at high Reynolds numbers, they can be used in industrial applications to predict the onset flow velocity and the intensity of acoustic resonances in side...
Journal Articles
Article Type: Research Papers
J. Pressure Vessel Technol. December 2009, 131(6): 061301.
Published Online: September 23, 2009
... computational fluid dynamics corrosion electrochemistry failure (mechanical) film flow flow simulation microfluidics multiphase flow pipe flow pipes surface cracks turbulence wear corrosion dynamic simulation multiphase flow protective films modeling fluid-structure interaction...
Journal Articles
Article Type: Research Papers
J. Pressure Vessel Technol. October 2009, 131(5): 051302.
Published Online: September 2, 2009
... fractions and mass fluxes. Fluidelastic instabilities, random turbulence excitation, and damping were investigated. The results were compared with those obtained for a similar tube bundle tested in an air-water cross flow and to those for a rotated triangular bundle similarly tested in Freon. 24 07...
Journal Articles
Article Type: Research Papers
J. Pressure Vessel Technol. June 2009, 131(3): 031307.
Published Online: April 28, 2009
...Tetsuya Matsui; Yasushi Uematsu; Koji Kondo; Takuo Wakasa; Takashi Nagaya The dynamic response of a floating roof in a cylindrical liquid storage tank under wind loads is investigated analytically. Wind tunnel test in a turbulent flow is carried out to measure the wind pressure distributing over...
Journal Articles
Article Type: Research Papers
J. Pressure Vessel Technol. June 2009, 131(3): 031305.
Published Online: April 13, 2009
... and ensure safe operation. The methodology incorporates Monte Carlo simulations to predict remaining service life of a vibrating heat exchanger tube with a small circumferential through-wall crack next to the tube sheet. Vibration excitation includes turbulence and low-level fluid-elastic forces. Leakage...
Journal Articles
Article Type: Research Papers
J. Pressure Vessel Technol. April 2009, 131(2): 021301.
Published Online: December 10, 2008
... to be considered in predicting the local areas of feeder pipes highly susceptible to flow-accelerated corrosion (FAC)-induced wall thinning. The CFD approach with schemes used in this study to simulate the turbulent flow situations inside the CANDU feeder pipes has been verified by showing a good agreement between...
Topics: Pipes
Journal Articles
Article Type: Research Papers
J. Pressure Vessel Technol. February 2009, 131(1): 011305.
Published Online: November 24, 2008
... the conduction in the tube wall with finite thickness and the convections in the internal and external fluids simultaneously so as to match the fluid-wall-fluid interface conditions properly. Both the internal and external turbulent flows are simulated using the standard k - ε model. From the results...
Journal Articles
Article Type: Research Papers
J. Pressure Vessel Technol. August 2008, 130(3): 031301.
Published Online: June 16, 2008
... errors can occur if fluid forces are evaluated with mainstream statistical turbulence models. In this paper, several models are applied to flow around a circular cylinder in the Reynolds number range from 500 up to 10 6 . Mainly 2D simulations are performed. Additionally, calculations are performed...
Journal Articles
Article Type: Research Papers
J. Pressure Vessel Technol. May 2008, 130(2): 021302.
Published Online: March 19, 2008
... computationally at disk positions 45 deg and 70 deg over a range of operating pressures. The range of pressure ratios was chosen to include subsonic and supersonic flow states. The flow fields were predicted using the k -epsilon renormalization group theory (RNG) turbulence model. The computational results were...
Journal Articles
Article Type: Research Papers
J. Pressure Vessel Technol. February 2008, 130(1): 011402.
Published Online: January 17, 2008
... compressible flow through a crack. In the crack morphology model, the flow is assumed by default to be fully rough turbulent, and the effective roughness to vary between a local roughness value for narrow cracks and a global value (i.e., the overall crack contours) for wide cracks. The effect of pressure drops...
Journal Articles
Article Type: Research Papers
J. Pressure Vessel Technol. August 2007, 129(3): 535–540.
Published Online: March 23, 2007
... domain, using a time history modal superposition method. Time history forcing functions are first obtained by inverse Fourier transform of the power spectral density function used in classical turbulence-induced vibration analyses. The fluid-structure coupling force, which is dependent on the cross-flow...
Journal Articles
Article Type: Research Papers
J. Pressure Vessel Technol. February 2007, 129(1): 14–20.
Published Online: April 15, 2006
.... For cases (c) and (d), the dimensionless pressure amplitude of the acoustic mode reaches a maximum at a Strouhal number similar to that of the turbulence broadband peak measured in the separation bubble downstream of the T-junction corner. Cases (a) and (b) exhibit a different type of flow-acoustic coupling...
Journal Articles
Article Type: Technical Briefs
J. Pressure Vessel Technol. November 2006, 128(4): 670–676.
Published Online: February 10, 2006
...P. Moussou The goal of the paper is to provide an estimation of the vibrations of a water pipe subjected to standard turbulent excitations. Firstly, a simplified expression of the acoustic pressure generated by a standard valve or orifice is proposed. It is based on the hydraulic pressure drop...