Example f621: Inflating the bladder with a pole-zero material.

This example shows the inflation of the bladder using the pole zero law.

The pole zero material parameters were originally created to model the heart muscle constitutive properties. The bladder is much more compliant in fully undeformed shape, therefore the material properties for the heart are only a first approximation of the bladder properties. Allowing for the extra compliance by moving out the poles and increasing the curvature makes the computation unstable and has to be done with care. This example uses the default properties (more compliant than the current heart parameters) as the constitutive parameters. However because of the bladder instability when fully collapsed, the starting point of this example has the bladder partially full. This simulates a patient in urinary retention.

The start and end points of the inflation are shown in the figures below.


Files used by this example are:

Name                      Modified     Size

3D_cartesian.ipcoor 09-Feb-2001 572 aux_pressure.ipbase 09-Feb-2001 1.9k blad_inflate.com 09-Feb-2001 2.0k blad_inflate.ipelem 09-Feb-2001 139k blad_inflate.ipelfb 09-Feb-2001 64k blad_inflate.ipfibr 09-Feb-2001 62k blad_inflate.ipinit 09-Feb-2001 6.0k blad_inflate.ipnode 09-Feb-2001 589k blad_ref_herm.ipbase 09-Feb-2001 5.6k blad_ref_herm.ipequa 02-May-2004 2.0k blad_ref_herm.ipequa.old 09-Feb-2001 1.9k blad_ref_herm.ipmate 24-May-2001 5.3k blad_ref_herm.ipsolv 16-Aug-2010 2.8k blad_ref_herm.ipsolv.old 13-Apr-2007 2.6k blad_solve_inflate.com 09-Feb-2001 3.5k bladder_minimal.ippara 12-Nov-2002 5.9k example_f21.com 09-Feb-2001 3.0k extra_faces.ipbase 09-Feb-2001 6.2k

Download the entire example:

Name                           Modified     Size

examples_f_f6_f62_f621.tar.gz 17-Aug-2010 173k

Testing status by version:

StatusTestedReal time (s)
IncompleteSat Mar 5 05:52:06 2016unknown

Testing status by file:


Graphical output from this problem is given here.


Html last generated: Sun Mar 6 05:51:37 2016

Input last modified: Mon Aug 16 11:38:59 2010


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