Example 5g5: LV inflation using nearly incompressible pole-zero material law

An elliptically shaped mesh in rectangular Cartesian coordinates is inflated.

Instead of enforceing incompressibility through the hydro-static pressure constraint a penalty function is added in the pole-zero cellML code: J^2-2J+1. This results in an extra penalty term for each stress-component.

This example is the same problem as example 5g3, except it is using this nearly incompressible approach and not the incompressibility choice in the ipequa file. The output should be relatively similar to 5g3.

Created by Espen Remme May 2004.
 

The comfile run by this example is as follows:

# Example 5g5

# If the example path is not set, default to current directory
if(!defined $example)
{
  $example = "./";
}

fem def param;r;emech;example
fem define coor;r;rcCoord;example
fem define base;r;basisfuncs;example
fem def;add base;r;PressBC;example
#
fem define nodes;r;rc3;example
fem define elements;r;rc;example
fem define fibre;r;simple;example
fem define element;r;simple;example fibre
  
# Material parameter groups
fem group elem 1..4 as apexElems
fem group elem 5..12 as betweenElems
fem group elem 13..16 as baseElems
fem group elem 5..16 as notApexElems

# Boundary Condition groups
fem group nodes 1,18 as fixedApexNodes
fem group nodes 14..17,31..34 as fixedBaseNodes
fem group nodes 14,16 as y_axisNodes
fem group nodes 15,17 as z_axisNodes

# Residual strains groups
fem group nodes 6..13 as nodes095
fem group nodes 1..5,14..22,31..34 as nodes100
fem group nodes 23..30 as nodes105

$name = "heartOriginal"
$file = $name
fem export nodes;$file as $name offset 1000
fem export elements;$file as $name offset_elem 1000

fem define equation;r;compressible;example lock
fem define material;r;cellMLmaterial;example
fem define acti;r;calcium000;example
fem define initial;r;x_Base_node_restricted;example
fem define solve;r;solve;example

# cellML stuff
fem group elem 1..16 as ALL_ELEMENTS
fem def grid;r;grid;example gauss class 2 
fem update grid geometry #sets up the grid geometry
fem group grid element ALL_ELEMENTS as ALL_GRID_POINTS
fem def equa;r;cellmlEquation;example class 2 #defines a cellml equation - see cellml.ipequa
fem def mate;d class 2 # set up conductivities- defaulted
fem define cell;r;polezero_nearly_incompressible;example class 2

fem group grid element apexElems as APEX_GRID_POINTS
fem group grid element betweenElems,baseElems as NOT_APEX_GRID_POINTS

fem group grid grid 1..3,10..12,19..21,28..30,37..39,46..48,55..57,64..66,73..75,82..84,91..93,100..102 as APEX_1_GRID_POINTS
fem group grid grid 4..6,13..15,22..24,31..33,40..42,49..51,58..60,67..69,76..78,85..87,94..96,103..105 as APEX_2_GRID_POINTS
fem group grid grid 7..9,16..18,25..27,34..36,43..45,52..54,61..63,70..72,79..81,88..90,97..99,106..108 as APEX_3_GRID_POINTS
fem group grid element betweenElems as BETWEEN_GRID_POINTS
fem group grid grid 325..327,334..336,343..345,352..354,361..363,370..372,379..381,388..390,397..399,406..408,415..417,424..426 as BASE_BOT_GRID_POINTS
fem group grid grid 328..330,337..339,346..348,355..357,364..366,373..375,382..384,391..393,400..402,409..411,418..420,427..429 as BASE_MID_GRID_POINTS
fem group grid grid 331..333,340..342,349..351,358..360,367..369,376..378,385..387,394..396,403..405,412..414,421..423,430..432 as BASE_TOP_GRID_POINTS

#fem def mate;r;mooney_rivlin;example cell class 2
fem def mate;r;inhomo;example cell class 2
fem def init;d class 2
fem def solv;r;cellMLsolve;example class 2 
fem solve class 2 to 0

fem list elements total

fem solve increment 1 iter 30 error 10e-8

fem list elements deformed total

$name = "heartInflated"
$file = $name
fem export nodes;$file field as $name offset 0000
fem export elements;$file field as $name offset_elem 0000

fem list strain;strain fibre
fem list stress;stress fibre total 

$file = "heartStress"
fem update gauss stress fibre total Cauchy
fem export gauss;$file yg as gauss_stress offset 0

$file = "heartStrain"
fem update gauss strain fibre extension_ratios
fem export gauss;$file yg as gauss_strain

fem update geometry from solution
$file = "heartInflated"
fem define nodes;w;$file

Files used by this example are:

Name                                   Modified     Size


example_5g5.com                        03-May-2004  3.4k
PressBC.ipbase                         03-May-2004  1.3k
basisfuncs.ipbase                      03-May-2004   16k
calcium000.ipacti                      03-May-2004  758 
cellMLmaterial.ipmate                  03-May-2004  1.2k
cellMLsolve.ipsolv                     13-Apr-2007  2.6k
cellmlEquation.ipequa                  03-May-2004  1.5k
compressible.ipequa                    03-May-2004  2.1k
emech.ippara                           03-May-2004  5.9k
gaussDraw.com                          03-May-2004  1.3k
grid.ipgrid                            03-May-2004  610 
inhomo.ipmatc                          03-May-2004  8.8k
polezero_nearly_incompressible.cml     03-May-2004   52k
polezero_nearly_incompressible.ipcell  04-May-2004  7.0k
rc.ipelem                              03-May-2004   15k
rc3.ipnode                             03-May-2004   75k
rcCoord.ipcoor                         03-May-2004  678 
simple.ipelfb                          03-May-2004  4.2k
simple.ipfibr                          03-May-2004  6.6k
solve.ipsolv                           16-Aug-2010  2.2k
solve.ipsolv.old                       13-Apr-2007  2.1k
x_Base_node_restricted.ipinit          03-May-2004  9.8k

Download the entire example:

Name                      Modified     Size


examples_5_5g_5g5.tar.gz  14-Aug-2014   72k

Testing status by version:

StatusTestedReal time (s)
i686-linux
cmSuccessSun Mar 6 00:23:08 201644
cm-debugSuccessSat Mar 5 02:07:02 2016243
mips-irix
cmSuccessThu Aug 16 04:30:55 2007383
cm-debugSuccessWed Jul 25 05:29:48 20072150
cm-debug-clear-mallocSuccessSat Aug 4 07:10:44 20072259
cm-debug-clear-malloc7SuccessMon Jul 30 06:44:15 20072189
cm64SuccessThu Aug 16 04:41:55 2007401
cm64-debugSuccessFri Aug 17 04:00:11 20072328
cm64-debug-clear-mallocSuccessTue Feb 1 09:58:27 2005930
rs6000-aix
cmSuccessWed Mar 4 01:25:48 200949
cm-debugSuccessMon Mar 2 02:31:49 2009789
cm64SuccessWed Mar 4 01:26:55 200953
cm64-debugSuccessTue Mar 3 02:35:59 2009777
x86_64-linux
cmSuccessSun Mar 6 00:02:18 201624
cm-debugSuccessSat Mar 5 00:08:57 2016113

Testing status by file:

Html last generated: Sun Mar 6 05:50:29 2016

Input last modified: Thu Aug 14 10:03:46 2014

CMISS Help / Examples / 5 / 5g / 5g5