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--- userfunctions:weertman [2012/11/15 01:41]
gag created
+++ userfunctions:weertman [2019/10/16 11:06] (current)
gagliar [General Description]
@@ Line 3: / Line 3: @@
 ==== General Informations ====
-  * **USF Fortran File:** //USF_Sliding.f90//
+  * **USF Fortran File:** ''USF_Sliding.f90''
-  * **USF Name:** //Sliding_Weertman//
+  * **USF Name:** ''Sliding_Weertman''
-  * **Required Input Variable(s):** A //Flow Solution// in //Flow Solution Name//, //Normal Vector//
+  * **Required Input Variable(s):** A ''Flow Solution'' in ''Flow Solution Name'', ''Normal Vector''
 ==== General Description ====
-The file //USF_Sliding.f90// contains two user functions to apply non-linear friction at the base of glacier.
+The file ''USF_Sliding.f90'' contains user functions to apply non-linear friction at the base of glacier.
-The first user function (//Sliding_Weertman//) is a non-linear Weertman-type friction law and is described in this page. The second user function (//Friction_Coulomb//) is a non-linear water pressure dependant friction law, as proposed by Schoof (2005) and Gagliardini et al. (2007), and is presented [[:userfunctions:coulomb|here]].
+The first user function (''Sliding_Weertman'') is a non-linear Weertman-type friction law and is described in this page. The second user function (''Friction_Coulomb'') is a non-linear water pressure dependant friction law, as proposed by Schoof (2005) and Gagliardini et al. (2007), and is presented [[:userfunctions:coulomb|here]]. The third user function (''Sliding_Budd'') is described [[:userfunctions:budd|here]] and is from Budd et al 1984 (Annals of Glaciology 5, page 29-36).
+The friction law in ''Weertman_Sliding'' is of the form:\\
+<m>  tau_b = C.{u_b}^{m - 1} . u_b  </m>\\
+The //Slip Coefficient// in Elmer is then given as\\
+<m>  C.{u_b}^{m - 1}  </m>\\
+When  <m>u_b < u_{t0}</m>, <m>u_b</m> in the previous equation is replaced by <m>u_{t0}</m> (linearisation for small velocity).
+The parameters to be given are:\\
+  * ''Weertman Friction Coefficient''      -> <m>C</m>
+  * ''Weertman Exponent''         -> <m>m</m>
+  * ''Weertman Linear Velocity'' -> <m>u_{t0}</m>
 ==== SIF contents ====
@@ Line 29: / Line 41: @@
   Slip Coefficient 2 =  Variable Coordinate 1
-    Real Procedure "./USF_Sliding" "Sliding_Weertman"
+    Real Procedure "ElmerIceUSF" "Sliding_Weertman"
   Slip Coefficient 3 =  Variable Coordinate 1
-    Real Procedure "./USF_Sliding" "Sliding_Weertman"
+    Real Procedure "ElmerIceUSF" "Sliding_Weertman"
   Weertman Friction Coefficient = Real 2.412579e-2
@@ Line 43: / Line 55: @@
 ==== Examples ====
-An example of the usage of the user function //Sliding_Weertman// TODO
+The Weertman friction law is used in the tests ''[ELMER_TRUNK]/elmerice/Tests/GL_MISMIP'' and ''[ELMER_TRUNK]/elmerice/Tests/Contact'' and especially tested in ''[ELMER_TRUNK]/elmerice/Tests/Friction_Weertman''.

userfunctions/weertman.1352943705.txt.gz · Last modified: 2012/11/15 01:41 by gag

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