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Questions tagged [turbulence]

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Wall functions and separation in turbine blade simulation

I am simulating a turbine and I have some question about standard wall function in FLUENT. Standard wall function requires $y^+$ value between 30 to 60 on the blade. but the following quote states: ...
user19061's user avatar
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4 votes
0 answers
481 views

How should I set the turbulent prandtl number in a turbulent compressible flow simulation?

I'm working on simulating compressible fluid flow over a flat plate with turbulence. The energy equation for compressible flow with turbulence requires modeling a turbulent heat flux of the form $$...
Paul's user avatar
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3 votes
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267 views

Why Taylor's microscale gives us information about the smallest scales of the flow?

So I understand the principles of two-point time correlations (covariance) and how you can just normalise that to get the autocorrelation. I also understand the integral time scale which is quite ...
thephysicsguy's user avatar
2 votes
2 answers
191 views

Imposing/ensuring a constant mass flow rate in turbulent flow simulation

I'm trying to simulate using Finite Elements (non commercial software) the Tube Bundle benchmark problem: http://cfd.mace.manchester.ac.uk/ercoftac/doku.php?id=cases:case078&s[]=tube&s[]=...
Terry's user avatar
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2 votes
0 answers
264 views

Obtaining the correct flat plate turbulent boundary layer thickness in a CFD simulation

I used a commercial CFD software to simulate incompressible turbulent flow of air over a flat plate. I setup a 2D domain 1.5m long in the x direction and .2m in the y direction. The boundary ...
Paul's user avatar
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1 vote
0 answers
34 views

Why is the turbulent kinetic energy $k=\overline{v_1'^2}+\overline{v_2'^2}+\overline{v_3'^2}$ even in 2D cases?

I'm writing an essay which partly includes writing about the Reynolds stress model where the dissipation term $\varepsilon_{ij}$ is assumed to be isotropic (since dissipation mostly occurs at small ...
Erik Sahlin's user avatar
1 vote
1 answer
97 views

Help with friction factors for non-Newtonian fluids

I've been researching about friction factors for non-Newtonian fluids and I've found quite inconsistent results. The power-law model correlations I've tested do not agree (within some interval) as to ...
Carlos Gouveia's user avatar
1 vote
0 answers
18 views

Distribution of turbulent energy dissipation in a stirred tank

Is detailed experimental information on the distribution of energy dissipation in a stirred tank(45o Pitch blade) available? I require this variation in all directions in a standard stirred tank ...
Saad's user avatar
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17 views

What are the forces acting on a rectangular polymer film submerged in a turbulent flow (stirred tank)?

I am new to research in fluid mechanics and for one of my experiments, I'd like your help. I need to write a force balance on a polymer film in a cylindrical tank at a fixed position. The film moves ...
flowcat's user avatar
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Turbulent flow, fluctuating part of velocity

Let's say we have a fully developed turbulent flow on x axis (simple shear flow). Time-averaged components of velocity on y and z axis are 0. If a lump of particles is moving upwards, then the ...
Sok's user avatar
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