====== LICHT ======
===== Description =====
Constitutive law defining distributed flow on a line, on a surface, or in volume \\
Last revision: L. Grisard - sept 1990 \\

==== The model ====
Definition of uniformly distributed flow on a line or on a surface, or in volume. This can be used in thermal analysis or in the analysis of flow in porous media.
==== Files ====
Prepro: LLICHT.F \\

===== Availability =====
|Plane stress state| YES |
|Plane strain state| YES |
|Axisymmetric state| YES |
|3D state| YES |
|Generalized plane state| YES |
===== Input file =====

==== Parameters defining the type of constitutive law ====
^ Line 1 (2I5, 60A1)^^
|IL|Law number|
|ITYPE| 195|
|COMMENT| Any comment (up to 60 characters) that will be reproduced on the output listing|
==== Integer parameters (only if NTANA=5, 13, or 15) ====
^ 1 line (I5) ^^
|IDDL| DDL number \\ For [[:prepro#(1) Remark on NTANA|NTANA]]=5 or 15 → 3 = water, 4 = air, 5 = temperature \\ For [[:prepro#(1) Remark on NTANA|NTANA]]=13 → 4 = water, 5 = air, 6 =temperature|

==== Real parameters ====
^ 1 line (2G10.0) ^^
|FLUXF| Flow per unit surface|
|FLUXD| Flow per unit surface|

These data are reference values. \\  \\
During the non linear analysis, FLUXF will be multiplied by the force multiplicator ALAMBF while FLUXD will be multiplied by the displacement multiplicator ALAMBD. \\ \\
An outgoing flow is considered as positive. \\
An entering flow is considered as negative.
===== Stresses =====
==== Number of stresses ====
1
==== Meaning ====
|SIG(NPI)|Current value of distributed flow|

===== State variables =====
==== Number of state variables ====
1
==== List of state variables ====
|Q(1)|= 0 (meaningless)|