Create a sub-task

Create a sub-task

Ver: 5

DESCRIPTION

Creates a new sub-task which becomes the current one; attributes are set through entries in this menu.

The contents of a sub-task consist of a set of equations, each one associated with its own material parameters, boundary conditions, and domain of application.

All sub-tasks belonging to the same task are solved simultaneously; every task must at least contain one sub-task.

OPTIONS

-1 Upper level menu

1 Generalized Newtonian isothermal flow problem

It is the default option for a new sub-task.
Available in 2-D, 2-1/2-D and 3-D. It calculates incompressible isothermal generalized Newtonian flows.
Momentum and mass equations are taken into account.

2 Generalized Newtonian non-isothermal flow problem

Available in 2-D, 2-1/2-D and 3-D. It calculates incompressible non-isothermal generalized Newtonian flows.
Momentum, energy and mass equations are taken into account.

3 Heat conduction problem

Available in 2-D, 2-1/2-D and 3-D. It solves heat conduction problems.
Only the energy equation is taken into account, but for a given velocity field.

4 Differential viscoelastic isothermal flow problem

Available for 2-D and 3D.
It calculates isothermal differential viscoelastic flows with multiple relaxation times.
Momentum and mass equations are solved together with a series of differential constitutive viscoelastic models (selected by the user).

5 Differential viscoelastic non-isothermal flow problem

Available for 2-D and 3D.
It calculates isothermal differential viscoelastic flows with multiple relaxation times.
Momentum and mass equations are solved together with a series of differential constitutive viscoelastic models (selected by the user).

6 Postprocessor

Available in 2-D, 2-1/2-D and 3-D. It performs specific calculations on the basis of previously calculated field, e.g., viscous heating, second invariant of the rate of deformation tensor, Newtonian stresses, or Force/Flux postprocessors.

7 Integral viscoelastic isothermal flow problem

Available for 2-D planar and axisymmetric problems.
It calculates isothermal integral viscoelastic flows with a spectrum of relaxation times.
Momentum and mass equations on one hand and integral viscoelastic constitutive model (selected by the user) on the other hand are solved in a decoupled iterative scheme.

8 Integral viscoelastic non-isothermal flow problem

Available for 2-D planar and axisymmetric problems.
It calculates non-isothermal integral viscoelastic flows with a spectrum of relaxation times.
Momentum, energy and mass equations on one side and integral viscoelastic constitutive model (selected by the user) on the other hand are solved in a decoupled iterative scheme.

9 Darcy isothermal flow problem

Available for 2-D, 2-1/2-D and 3-D geometries.
It calculates isothermal flows of fluids through porous media, which obey the Darcy equation. In the general form, the porous media may show a non-isotropic permeability to the flow (tensor permeability).

10 Darcy non-isothermal flow problem

Available for 2-D, 2-1/2-D and 3-D geometries.
It calculates non-isothermal flows of fluids through porous media, which obey the Darcy equation. In the general form, the porous media may show a non-isotropic permeability to the flow.
Darcy and energy equations are taken into account.

12 Mass transfer problem

Available in 2-D, 2-1/2-D and 3-D when at least one 'Slightly compressible flow problem' has been defined.
Advection-diffusion for chemical species. Chemical reactions on the domain boundary are introduced as flux boundary conditions.
Mass transport equation is taken into account and solved by using the velocity and temperature fields obtained from other sub-tasks, e.g., the gas flow problem. A first order kinetic law is used to model the flux of species on the boundary.

13 Potential problem

Available in 2-D and 3-D.
It calculates the electrical potential in a domain. If a heat conduction problem or a non-isothermal flow problem has been defined, the heat dissipation due to the Joule effect is also computed and added to the energy equation.

14 Film model : Gen. Newtonian isothermal

Available in 2-D.
It calculates isothermal generalized Newtonian flows in the peculiar case of film drawing.

15 Film model : Gen. Newtonian non-isothermal

Available in 2-D .
It calculates non-isothermal generalized Newtonian flows in the peculiar case of film drawing.

16 Film model : Viscoelastic isothermal

Available in 2-D .
It calculates isothermal differential viscoelastic flows in the peculiar case of film drawing.

22 Film model : Viscoelastic non-isothermal

Available in 2-D .
It calculates non-isothermal differential viscoelastic flows in the peculiar case of film drawing.

17 Shell model : Gen. Newtonian isothermal

Available in 3-D, transient simulations only.
It calculates isothermal generalized Newtonian flows in a shell in a 3D space.
This type of sub-task has been designed for Blow Molding and Thermoforming applications.

18 Shell model : Gen. Newtonian non-isothermal

Available in 3-D, transient simulations only.
It calculates non-isothermal generalized Newtonian flows in a shell in a 3D space.
This type of sub-task has been designed for Blow Molding and Thermoforming applications.

19 Shell model : Viscoelastic isothermal

Available in 3-D, transient simulations only.
It calculates isothermal viscoelastic flows in a shell in a 3D space.
A KBKZ integral model is used, allowing for multiple relaxation modes.
This type of sub-task has been designed for Blow Molding and Thermoforming applications.

23 Shell model : Viscoelastic non-isothermal

Available in 3-D, transient simulations only.
It calculates non-isothermal viscoelastic flows in a shell in a 3D space.
A KBKZ integral model is used, allowing for multiple relaxation modes.
This type of sub-task has been designed for Blow Molding and Thermoforming applications.

20 Transport of species

Available in 2-D and in 3-D.
Its computes the transport of a chemical component in a chemical reaction analysis.

21 Closure

Available in 2-D in 3-D.
Closes a chemical system, it means that the concentration of a given component is equal to ( 1 - sum of others components),
no transport problem being defined for that component.

NOTES Once the current sub-task attributes have been defined, the user enters a title which is used as a reference in future menus.
In multi-domain simulations, the title should reflect the part of the domain on which the sub-task is being defined. EXAMPLES In the case of multi-domain calculations (coextrusion, solid-liquid heat exchange, etc.), a distinct sub-task must be defined
for each domain endowed with its own set of equations and/or material properties. SEE ALSO

continuum equations (UM)

create a new task (RM)

material data

shear rate dependence of viscosity

differential viscoelastic models

integral viscoelastic models

porous medium and fluid viscosity

-1	Upper level menu
1	Generalized Newtonian isothermal flow problem
	It is the default option for a new sub-task. Available in 2-D, 2-1/2-D and 3-D. It calculates incompressible isothermal generalized Newtonian flows. Momentum and mass equations are taken into account.
2	Generalized Newtonian non-isothermal flow problem
	Available in 2-D, 2-1/2-D and 3-D. It calculates incompressible non-isothermal generalized Newtonian flows. Momentum, energy and mass equations are taken into account.
3	Heat conduction problem
	Available in 2-D, 2-1/2-D and 3-D. It solves heat conduction problems. Only the energy equation is taken into account, but for a given velocity field.
4	Differential viscoelastic isothermal flow problem
	Available for 2-D and 3D. It calculates isothermal differential viscoelastic flows with multiple relaxation times. Momentum and mass equations are solved together with a series of differential constitutive viscoelastic models (selected by the user).
5	Differential viscoelastic non-isothermal flow problem
	Available for 2-D and 3D. It calculates isothermal differential viscoelastic flows with multiple relaxation times. Momentum and mass equations are solved together with a series of differential constitutive viscoelastic models (selected by the user).
6	Postprocessor
	Available in 2-D, 2-1/2-D and 3-D. It performs specific calculations on the basis of previously calculated field, e.g., viscous heating, second invariant of the rate of deformation tensor, Newtonian stresses, or Force/Flux postprocessors.
7	Integral viscoelastic isothermal flow problem
	Available for 2-D planar and axisymmetric problems. It calculates isothermal integral viscoelastic flows with a spectrum of relaxation times. Momentum and mass equations on one hand and integral viscoelastic constitutive model (selected by the user) on the other hand are solved in a decoupled iterative scheme.
8	Integral viscoelastic non-isothermal flow problem
	Available for 2-D planar and axisymmetric problems. It calculates non-isothermal integral viscoelastic flows with a spectrum of relaxation times. Momentum, energy and mass equations on one side and integral viscoelastic constitutive model (selected by the user) on the other hand are solved in a decoupled iterative scheme.
9	Darcy isothermal flow problem
	Available for 2-D, 2-1/2-D and 3-D geometries. It calculates isothermal flows of fluids through porous media, which obey the Darcy equation. In the general form, the porous media may show a non-isotropic permeability to the flow (tensor permeability).
10	Darcy non-isothermal flow problem
	Available for 2-D, 2-1/2-D and 3-D geometries. It calculates non-isothermal flows of fluids through porous media, which obey the Darcy equation. In the general form, the porous media may show a non-isotropic permeability to the flow. Darcy and energy equations are taken into account.
12	Mass transfer problem
	Available in 2-D, 2-1/2-D and 3-D when at least one 'Slightly compressible flow problem' has been defined. Advection-diffusion for chemical species. Chemical reactions on the domain boundary are introduced as flux boundary conditions. Mass transport equation is taken into account and solved by using the velocity and temperature fields obtained from other sub-tasks, e.g., the gas flow problem. A first order kinetic law is used to model the flux of species on the boundary.
13	Potential problem
	Available in 2-D and 3-D. It calculates the electrical potential in a domain. If a heat conduction problem or a non-isothermal flow problem has been defined, the heat dissipation due to the Joule effect is also computed and added to the energy equation.
14	Film model : Gen. Newtonian isothermal
	Available in 2-D. It calculates isothermal generalized Newtonian flows in the peculiar case of film drawing.
15	Film model : Gen. Newtonian non-isothermal
	Available in 2-D . It calculates non-isothermal generalized Newtonian flows in the peculiar case of film drawing.
16	Film model : Viscoelastic isothermal
	Available in 2-D . It calculates isothermal differential viscoelastic flows in the peculiar case of film drawing.
22	Film model : Viscoelastic non-isothermal
	Available in 2-D . It calculates non-isothermal differential viscoelastic flows in the peculiar case of film drawing.
17	Shell model : Gen. Newtonian isothermal
	Available in 3-D, transient simulations only. It calculates isothermal generalized Newtonian flows in a shell in a 3D space. This type of sub-task has been designed for Blow Molding and Thermoforming applications.
18	Shell model : Gen. Newtonian non-isothermal
	Available in 3-D, transient simulations only. It calculates non-isothermal generalized Newtonian flows in a shell in a 3D space. This type of sub-task has been designed for Blow Molding and Thermoforming applications.
19	Shell model : Viscoelastic isothermal
	Available in 3-D, transient simulations only. It calculates isothermal viscoelastic flows in a shell in a 3D space. A KBKZ integral model is used, allowing for multiple relaxation modes. This type of sub-task has been designed for Blow Molding and Thermoforming applications.
23	Shell model : Viscoelastic non-isothermal
	Available in 3-D, transient simulations only. It calculates non-isothermal viscoelastic flows in a shell in a 3D space. A KBKZ integral model is used, allowing for multiple relaxation modes. This type of sub-task has been designed for Blow Molding and Thermoforming applications.
20	Transport of species
	Available in 2-D and in 3-D. Its computes the transport of a chemical component in a chemical reaction analysis.
21	Closure
	Available in 2-D in 3-D. Closes a chemical system, it means that the concentration of a given component is equal to ( 1 - sum of others components), no transport problem being defined for that component.