Film Casting Model


Theory	See Multilayer Film Casting.
Provided By	[physics continuum] > Models > Optional Models
Example Node Path	Continua > Physics 1 > Models > Film Casting
Requires	Optional Models: Two Dimensional Flow: Viscous Flow Time: Steady, Implicit Unsteady PolymerDisplacement: Free Surface
Properties	Stabilize Positions, Individual Stress Per Layer. See Film Casting Properties.
Activates	Model Controls (child nodes)	Extra Layers. See Extra Layers Properties.
	Initial Conditions	Film Thickness The thickness of the film at the beginning of the simulation. For multilayer film casting, you specify the initial film thickness for each layer individually.
	Boundary Inputs	Film Thickness, Velocity. See Boundary Settings
	Monitors	Continuity, Film Thickness
	Field Functions	Film Thickness, Layer [n] Thickness. See Film Casting Field Functions.

Film Casting Properties

Stabilize Positions: When On, the model stops using output from the mesh morpher after the maximum material iteration. The default is Off. The option stabilizes high-draw-ratio film casting problems. It is intended for cases where stability is difficult to maintain, such as low elongational viscosity.
Individual Stress Per Layer: When On, each film layer has an individual stress that is governed by the defined constitutive equation Eqn. (748). When Off, there is only one stress variable which is the sum of stresses from each layer, weighted according to the layer thickness. The default is On.

Film Casting Boundary Settings

Velocity Inlet

Film Thickness: The total thickness of all film layers as the film leaves the die, $h$ in Eqn. (746).
Velocity: The velocity of the film as it leaves the die.

Extra Layers

Adds additional film layers for multilayer film casting. The layers are all modeled in a single phase. Multilayer film casting has the following modeling requirements:

Clearly identify layers and their order, since their order has meaning for the modeled physics.
The layers are assumed to not mix.
The layers are assumed to not react with each other.
The layers are assumed to be in perfect contact such that the iso-strain condition applies and hence no stress is communicated between the layers. The stress response is simply the sum of the stresses of each layer.
You must specify the constitutive equation, either viscoelastic or generalized Newtonian, to be the same for all layers, so that either all layers are generalized Newtonian or all are viscoelastic. The method for viscoelastic mode, however, can vary; for example, the first layer can be eXtended PomPom and the second layer can be PhanThien-Tanner/JS.-lin.
In the case of viscoelastic material, specify the number of modes to be the same in every layer.
Specify the method that you use for each physical property, such as density or specific heat, to be the same in every layer.

Properties

None.

Right-Click Actions

New: Creates a Layer n node that allows you to specify the material properties of each layer. See Material Property Methods for Rheology.

Film Casting Field Functions

Film Thickness: Total thickness of the film, $h$ in Eqn. (746).

Layer[n]::FilmThickness: For multilayer film casting, the thickness of later $n$ . Corresponds to $h_{i}$ in Eqn. (746).