Maxwell model

Maxwell model

Ver: 1

DESCRIPTION

For a Maxwell model, the extra-stress tensor T obeys the following constitutive equation :
T + trelax * Tup = 2 * visc * D
where D is the symmetric part of the velocity gradient tensor, trelax is the relaxation time, visc is the shear viscosity,
and the subscript "up" denotes the upper-convected derivative operator.
By default, visc = 1 and trelax = 1.
Selecting an option allows the user to modify the corresponding material parameter.

OPTIONS

-1 Upper level menu

1 Modification of visc

2 Modification of trelax

NOTES A large relaxation time leads to strong non-linearities. The use of a non-linear strategy is recommanded for increasing
this parameter : the current task should, therefore, be of the pseudo-evolution type.

The user should be aware of the system of units, if dimensional values are used.

The units for trelax and visc, as well as for T and D are :

parameter mass length time temperature

trelax - - 1 -

visc 1 -1 -1 -

T 1 -1 -2 -

D - - -1 -

SEE ALSO

differential viscoelastic fluids (TB)
continuum equations (TB)
differential viscoelastic models (RM)
evolution (TB)
s-dependence (RM)
create a new task (RM)
system of units (RM)

-1	Upper level menu
1	Modification of visc
2	Modification of trelax

`parameter`	`mass`	`length`	`time`	`temperature`
`trelax`	`-`	`-`	`1`	`-`
`visc`	`1`	`-1`	`-1`	`-`
T	1	-1	-2	-
`D`	`-`	`-`	`-1`	`-`