Example 21a: Using data points to redefine deforming 2D planar mesh

This example uses data points to define the deformation of a 2D mesh. Stresses and strains are calculated based upon these deformations.

The comfile run by this example is as follows:

# Example_21a Using data points to redefine deforming 2D planar mesh

fem
fem define node;r;datafit;example   #Define 9 nodes for initial square mesh.
fem define base;r;;example          #Define a bilinear basis function.
fem define element;r;;example       #Define 4 elements.
fem define fibre;d
fem define element;r;;example fibre
fem define field;r;;example         #Define 2 field variables.
fem define element;r;;example field #Define field elements
fem define data;r;;example          #Define 19 data points (geom only).
fem define xi;c internal            #Calculate Xi locations on initial mesh.
fem list data                       #List data x,y and Xi positions.
fem define fit;r;;example geom      #Linear fit with no constraints.
fem define window         
fem draw line                       #Draw the initial square mesh.
fem draw data trace                 #Draw Xi locations on initial mesh.
fem define data;r;datafit_def;example #Read in new data positions.
fem draw data                       #Draw new data set.
fem fit                             #Fit nodes (--> Xi points close to data pts).
fem list node                       #Note field values have new nodal positions.
#fem draw line field                 !New mesh drawn from nodal field values.

fem define equation;r;datafit;example #Define finite elasticity problem.
fem update solution field 1,2
fem list strain                     #Strain calculated from XP and ZP.   
fem draw strain vectors scale 0.1   #Strain eigenvectors.

fem update geometry from field      #This overwrites original mesh.
fem draw data trace                 #Draw Xi positions on new mesh.
fem draw data projections           #Data pts projected to new mesh.
fem list data errors                #Errors in fit.
fem draw lines
fem draw nodes
fem draw elements
fem export nodes
fem export elements
fem 

Additional testing commands:

FEM list node
FEM list data error

Files used by this example are:

Name                   Modified     Size

example_21a.com        07-Jun-2000  1.8k
datafit.exelem         10-Apr-2000  3.0k
datafit.exnode         10-Apr-2000  1.4k
datafit.ipbase         10-Apr-2000  1.1k
datafit.ipdata         10-Apr-2000  2.5k
datafit.ipelem         10-Apr-2000  1.1k
datafit.ipelfb         10-Apr-2000  640 
datafit.ipelfd         10-Apr-2000  868 
datafit.ipequa         02-May-2004  1.7k
datafit.ipfiel         10-Apr-2000  1.7k
datafit.ipfit          13-Apr-2007  1.7k
datafit.ipnode         10-Apr-2000  1.4k
datafit.ipxi           10-Apr-2000  665 
datafit_def.ipdata     10-Apr-2000  2.5k
example_21a.cmgui_com  10-Apr-2000  581 
test_output.com        10-Apr-2000   34 

Download the entire example:

Name                      Modified     Size

examples_2_21_21a.tar.gz  27-Aug-2010  7.0k

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.

  
  

Html last generated: Sun Mar 6 05:50:10 2016

Input last modified: Thu Aug 26 13:06:54 2010