Introductory FLUENT Training-Boundary Conditions

•To define a problem that results in a unique solution, you must specify information on the flow variables at boundaries.

–Specify fluxes of mass, momentum, energy, etc. into the domain.

•

•Defining boundary conditions involves:

–Identifying the boundary locations

–Supplying information at the boundaries

•

•The data required at a boundary depends upon the boundary condition type and the physical models employed.

•

•You must be aware of the information that is required of the boundary condition and locate the boundaries where the information on the flow variables are known or can be reasonably approximated

–Poorly defined boundary conditions can have a significant impact on your solution

•A fluid cell zone is a group of cells for which all active equations are solved.

•

•Fluid material selection is required.

–For multiple species or multiphase
flows, the material is not shown. 
Instead, the fluid zone consists of the
mixture of the phases.

•

•Optional inputs

–Porous region

–Source terms

–Laminar region

–Fixed Values

Radiation

•A porous zone is a special type of fluid zone.

–Enable Porous Zone option in the Fluid panel.

–Pressure loss in flow determined via user inputs
of resistance coefficients to lumped parameter
model

•Used to model flow through porous
media and other uniformly distributed
flow resistances.

–Packed beds

–Filter papers

–Perforated plates

–Flow distributors

–Tube banks

•

•Inputs are directional viscous and
inertial resistance coefficients.

Get free full Tutorial!

Please send me email:

cadxneter@hotmail.com