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Python code to calculate turbulence intensity based on Reynolds number and surface roughness.

October 2019

DOI:10.13140/RG.2.2.25385.13928

Authors:

Nils Basse

RISE Research Institutes of Sweden

Python code to calculate turbulence intensity based on Reynolds number and surface roughness.

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Turbulence Intensity Scaling: A Fugue

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October 2019

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Effect of surface roughness on the velocity spread in electron guns for gyrotrons

March 1997 · International Journal of Infrared and Millimeter Waves

The effects of the roughness of the cathode surface on the emittance of an electron beam in a gyrotron gun are investigated. Parameter studies using a very simple model are performed in order to determine a reasonable parametrization of the effect for use in the BFCPIC and BFCRAY codes. Calculations are then performed for a gun in use at FZK.

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We study streamwise turbulence intensity definitions using smooth- and rough-wall pipe flow measurements made in the Princeton Superpipe. Scaling of turbulence intensity with the bulk (and friction) Reynolds number is provided for the definitions. The turbulence intensity scales with the friction factor for both smooth- and rough-wall pipe flow. Turbulence intensity definitions providing the best ... [Show full abstract] description of the measurements are identified. A procedure to calculate the turbulence intensity based on the bulk Reynolds number (and the sand-grain roughness for rough-wall pipe flow) is outlined.

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An Algebraic Non-equilibrium Turbulence Model of the High Reynolds Number Transition Region

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We present a mixing length based algebraic turbulence model calibrated to pipe flow; the main purpose of the model is to capture the increasing turbulence production-to-dissipation ratio observed in connection with the high Reynolds number transition region. The model includes the mixing length description by Gersten and Herwig which takes the observed variation of the von Kármán number with ... [Show full abstract] Reynolds number into account. Pipe wall roughness effects are included in the model. Results are presented for area-averaged (integral) quantities which can be used both as a self-contained model and as initial inlet boundary conditions for computational fluid dynamics simulations.

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Python code to calculate turbulence intensity based on Reynolds number and surface roughness.

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