what is mean of LAMINAR? What is mean of LVEL?

Laminar means laminar flow as opposed to the turbulent flow that occurs a high Reynolds number.

LVEL stands for lengthscale*velocity model, which is an algebraic turbulence model that is valid throughout the laminar, transitional and fully-turbulent regions of a boundary layer. This turbulence model is useful for flow situations characterised by cluttered spaces, such as for example the flow around many closely-spaced objects as encountered in electronics-cooling applications. The model presumes the existence of bounding walls, and so it is not recommended for unconfined flows like free jets.

if so, can I use the LVEL model to simulate the solid-water flow at a high Reynolds number in a straight pipe?

You can but the LVEL model knows nothing of turbulence modulation due to solid particles. The k-e model can also be used and there are extensions to account for these effects, if you believe they are important. Look in the advanced multi-phase flow library for examples. I believe there are some in that part of teh library.

[pratikddhoot]

Originally Posted by Michael Malin
;158835

Laminar means laminar flow as opposed to the turbulent flow that occurs a high Reynolds number.

LVEL stands for lengthscale*velocity model, which is an algebraic turbulence model that is valid throughout the laminar, transitional and fully-turbulent regions of a boundary layer. This turbulence model is useful for flow situations characterised by cluttered spaces, such as for example the flow around many closely-spaced objects as encountered in electronics-cooling applications. The model presumes the existence of bounding walls, and so it is not recommended for unconfined flows like free jets.

Does this model use something like dimensionless turbulent viscosity? If yes, how is it calculated?