3.6.1 Overview

The primary inputs that you must provide for the continuous fiber model calculations in ANSYS FLUENT are the starting positions, mass flow rate, take up positions, and other parameters for each fiber. These provide the boundary conditions for all dependent variables to be solved in the continuous fiber model. The primary inputs are:

• Start point ( $x$, $y$, $z$ coordinates) of the fiber.

• Number of fibers in group. Each defined fiber can represent a group of fibers which will only be used to compute the appropriate source terms of a group of fibers.

• Diameter of the fiber nozzle, $d_f$.

• Mass flow rate per nozzle to compute the velocity of the fiber fluid in the nozzle. The velocity is used as boundary condition for the fiber momentum equation.

• Temperature of the fiber at the nozzle, $T_f$.

• Solvent mass fraction of the fiber fluid in the nozzle. This value is used as boundary condition for the solvent continuity equation.

• Take-up point ( $x$, $y$, $z$ coordinates) of the fiber.

• Velocity or force at take-up point to describe the second boundary condition needed for the fiber momentum equation (see Equation  2.2-4).

In addition to these parameters you have to define parameters for the grid which is distributed between the start position and take-up point of the fibers. On this grid the dependent fiber variables are solved, by discretizing Equations  2.2-1, 2.2-4 and 2.2-11.

You can define any number of different sets of fibers provided that your computer has sufficient memory.