Example 1391: Defining a mesh containing hanging nodes

This example demonstrates how to create a mesh containing hanging nodes. By choosing a special mapping when defining coordinates, hanging nodes are detected and their degrees of freedom (including initial geometry) are mapped to the nodes of the edge of the element in which they hang.

The comfile run by this example is as follows:

#Example_11a Defining a mesh containing hanging nodes                        

FEM                              
FEM define parameters;r;example_1391;example #parameter set for 
#                                 !mesh degree of freedoms to solution 
#                                 !degree of freedoms mappinging

FEM define coordinates;r;;example #define non-standard mapping 
#                                 !for hanging nodes
FEM define node;r;;example        #position hanging node just inside the
#                                 !element edge on which it is to hang
FEM define base;r;;example
FEM define win
FEM draw node
FEM define element;r;;example  
FEM draw lines
FEM change node hanging node 5  #moves hanging node to the the nearest 
#                               !element edge. As well as interpolating
#                               !the geometry of the hanging node the 
#                               !derivatives are also interpolated
FEM draw lines
FEM update scale normalise      #Normalises the nodal derivatives and 
#                               !recalculates the arc lengths and 
#                               !scale factors
FEM draw lines
FEM









                                                                    

Additional testing commands:

fem list node

Files used by this example are:

Name                 Modified     Size

example_1391.com     20-Nov-2001  1.2k
example_1391.ipbase  10-Apr-2000  1.5k
example_1391.ipcoor  10-Apr-2000  976 
example_1391.ipelem  10-Apr-2000  906 
example_1391.ipnode  10-Apr-2000  5.0k
example_1391.ippara  12-Nov-2002  5.9k
test_output.com      10-Apr-2000   14 

Download the entire example:

Name                           Modified     Size

examples_1_13_139_1391.tar.gz  18-Aug-2006   16k

Testing status by version:

Testing status by file:

• cmiss_test.log
  

  i686-linux
  Success	cm:	cmiss_test.log.retain.
  Success	cm-debug:	cmiss_test.log.retain.
  mips-irix
  Success	cm:	cmiss_test.log.retain.
  Success	cm-debug:	cmiss_test.log.retain.
  Success	cm-debug-clear-malloc:	cmiss_test.log.retain.
  Success	cm-debug-clear-malloc7:	cmiss_test.log.retain.
  Success	cm64:	cmiss_test.log.retain.
  Success	cm64-debug:	cmiss_test.log.retain.
  Success	cm64-debug-clear-malloc:	cmiss_test.log.retain.
  rs6000-aix
  Success	cm:	cmiss_test.log.retain.
  Success	cm-debug:	cmiss_test.log.retain.
  Success	cm64:	cmiss_test.log.retain.
  Success	cm64-debug:	cmiss_test.log.retain.
  x86_64-linux
  Success	cm:	cmiss_test.log.retain.
  Success	cm-debug:	cmiss_test.log.retain.

  
  
• cmiss_test.out
  

  i686-linux
  Success	cm:	ndiff test: no significant differences with generic answer.
  Success	cm-debug:	ndiff test: no significant differences with generic answer.
  mips-irix
  Success	cm:	ndiff test: no significant differences with generic answer.
  Success	cm-debug:	ndiff test: no significant differences with generic answer.
  Success	cm-debug-clear-malloc:	ndiff test: no significant differences with generic answer.
  Success	cm-debug-clear-malloc7:	ndiff test: no significant differences with generic answer.
  Success	cm64:	ndiff test: no significant differences with generic answer.
  Success	cm64-debug:	ndiff test: no significant differences with generic answer.
  Success	cm64-debug-clear-malloc:	ndiff test: no significant differences with generic answer.
  rs6000-aix
  Success	cm:	ndiff test: no significant differences with generic answer.
  Success	cm-debug:	ndiff test: no significant differences with generic answer.
  Success	cm64:	ndiff test: no significant differences with generic answer.
  Success	cm64-debug:	ndiff test: no significant differences with generic answer.
  x86_64-linux
  Success	cm:	ndiff test: no significant differences with generic answer.
  Success	cm-debug:	ndiff test: no significant differences with generic answer.

  
  

Graphical output from this problem is given here.

Html last generated: Sun Mar 6 05:50:06 2016

Input last modified: Tue Nov 12 12:02:24 2002