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Reconciliation of measured and predicted unsteady skin friction

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Reconciliation of measured and predicted unsteady skin friction. / Vardy, A. E.; Brown, J.; He, S.

BHR Group - Surge Analysis - System Design, Simulation, Monitoring and Control, 10th International Conference on Pressure Surges . BHR Group, 2008. p. 365-377.

Research output: Chapter in Book/Report/Conference proceedingOther chapter contribution

Harvard

Vardy, AE, Brown, J & He, S 2008, 'Reconciliation of measured and predicted unsteady skin friction'. in BHR Group - Surge Analysis - System Design, Simulation, Monitoring and Control, 10th International Conference on Pressure Surges . BHR Group, pp. 365-377, 10th International Conference on Pressure Surges, Edinburgh, United Kingdom, 14-16 May.

APA

Vardy, A. E., Brown, J., & He, S. (2008). Reconciliation of measured and predicted unsteady skin friction. In BHR Group - Surge Analysis - System Design, Simulation, Monitoring and Control, 10th International Conference on Pressure Surges . (pp. 365-377). BHR Group.

Vancouver

Vardy AE, Brown J, He S. Reconciliation of measured and predicted unsteady skin friction. In BHR Group - Surge Analysis - System Design, Simulation, Monitoring and Control, 10th International Conference on Pressure Surges . BHR Group. 2008. p. 365-377.

Author

Vardy, A. E.; Brown, J.; He, S. / Reconciliation of measured and predicted unsteady skin friction.

BHR Group - Surge Analysis - System Design, Simulation, Monitoring and Control, 10th International Conference on Pressure Surges . BHR Group, 2008. p. 365-377.

Research output: Chapter in Book/Report/Conference proceedingOther chapter contribution

Bibtex - Download

@inbook{711ff25b3f21421da46887fd1c43ac8f,
title = "Reconciliation of measured and predicted unsteady skin friction",
publisher = "BHR Group",
author = "Vardy, {A. E.} and J. Brown and S. He",
year = "2008",
isbn = "978-185598095-2",
pages = "365-377",
booktitle = "BHR Group - Surge Analysis - System Design, Simulation, Monitoring and Control, 10th International Conference on Pressure Surges",

}

RIS (suitable for import to EndNote) - Download

TY - CHAP

T1 - Reconciliation of measured and predicted unsteady skin friction

A1 - Vardy,A. E.

A1 - Brown,J.

A1 - He,S.

AU - Vardy,A. E.

AU - Brown,J.

AU - He,S.

PB - BHR Group

PY - 2008/1/1

Y1 - 2008/1/1

N2 - Fundamental differences between measured and predicted skin friction forces in unsteady pipe flows are addressed. Strong evidence is presented to demonstrate the existence of three types of behaviour that are characterised as (i) approximately frozen turbulent viscosity, (ii) rapidly changing viscosity and (iii) gradually evolving viscosity. All three types are illustrated for the particular case of constant uniform acceleration from an initially steady flow. It is shown: that frozen viscosity assumptions are suitable after sudden changes from steady flow and that they remain applicable for significant time; that frozen-viscosity models can give reasonable predictions of damping of pressure waves measured in well known laboratory experiments; that experimental measurements with which the frozen-viscosity models have been compared unfavourably were obtained during periods of gradually-evolving viscosity; that the behaviour of flows during the period of gradually-evolving viscosity can be interpreted in a physically plausible manner. Much of the evidence used to justify the above deductions is obtained from a CFD analysis using a low Reynolds number RANS approach. The use of this model is itself justified by comparison with experiments that demonstrate its ability to predict delays in turbulence responses with sufficient accuracy for the purposes of this paper. © BHR Group 2008.

AB - Fundamental differences between measured and predicted skin friction forces in unsteady pipe flows are addressed. Strong evidence is presented to demonstrate the existence of three types of behaviour that are characterised as (i) approximately frozen turbulent viscosity, (ii) rapidly changing viscosity and (iii) gradually evolving viscosity. All three types are illustrated for the particular case of constant uniform acceleration from an initially steady flow. It is shown: that frozen viscosity assumptions are suitable after sudden changes from steady flow and that they remain applicable for significant time; that frozen-viscosity models can give reasonable predictions of damping of pressure waves measured in well known laboratory experiments; that experimental measurements with which the frozen-viscosity models have been compared unfavourably were obtained during periods of gradually-evolving viscosity; that the behaviour of flows during the period of gradually-evolving viscosity can be interpreted in a physically plausible manner. Much of the evidence used to justify the above deductions is obtained from a CFD analysis using a low Reynolds number RANS approach. The use of this model is itself justified by comparison with experiments that demonstrate its ability to predict delays in turbulence responses with sufficient accuracy for the purposes of this paper. © BHR Group 2008.

UR - http://www.bhrconferences.com/pressure_surges_10.aspx

UR - http://www.scopus.com/inward/record.url?scp=56149106238&partnerID=8YFLogxK

M1 - Other chapter contribution

SN - 978-185598095-2

BT - BHR Group - Surge Analysis - System Design, Simulation, Monitoring and Control, 10th International Conference on Pressure Surges

T2 - BHR Group - Surge Analysis - System Design, Simulation, Monitoring and Control, 10th International Conference on Pressure Surges

SP - 365

EP - 377

ER -

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