FLUENT code has been developed by Fluent Inc.(USA). The FLUENT code is a state-of-the- art computer code for modelling incompressible and compressible fluid flow and heat transfer in complex geometries. FLUENT provides complete mesh flexibility, solving flows problems with unstructured meshes that can be generated about complex geometries with relative ease. Supported mesh types include 2D triangular/quadrilateral, 3D tetra — hedral/hexahedral/pyramid/wedge, and mixed (hybrid) meshes. FLUENT also allows to refine the grid structure, depending on the flow solution. This solution-adaptive grid capability is particularly useful for accurately predicting flow fields in regions with large gradients, such as free shear layers and boundary layers. In comparison to solutions on structured or block — structured grids, this feature significantly reduces the time required to generate a "good" grid. Solution-adaptive refinement makes it easier to perform grid refinement studies and reduces the computational effort required to achieve a desired level of accuracy; since mesh refinement is limited to those regions where greater mesh resolution is needed.

The FLUENT has the following modelling capabilities:

— Flows in 2D or 3D geometries using unstructured solution-adaptive triangular/tetrahedral, quadrilateral/hexahedral, or mixed (hybrid) grids that include prisms (wedges) or pyramids: (Both conformal and hanging-node meshes are acceptable.);

— Incompressible or compressible flows;

— Steady-state or transient analysis;

— Inviscid, laminar, and turbulent flows;

— Newtonian or non-Newtonian flow;

— Convective heat transfer, including natural or forced convection;

— Coupled conduction/convective heat transfer;

— Radiation heat transfer;

— Inertial (stationary) or non-inertial (rotating) reference frame models;

— Lagrangian trajectory calculations for a dispersed phase of parti cles/droplets/bubbles, including

— coupling with the continuous phase flow through porous media

— one-dimensional fan/heat-exchanger performance-models

— two-phase flows, including cavitation

— free-surface flows with complex surface shapes.