Abaqus Fluid Inflation Problem 1

[MannySingh]

Hi All,

I have successfully modeled a 3D enclosed fluid cavity, and using the FLUID INFLATION method, I have been able to inflate the cavity.
The only problem I am having is controlling the pressure gradient of the fluid elements within the cavity.

I want to add an increased pressure gradient but I am not sure on how to accomplish this.
I am unable to use the FLUID FLUX method as my cavity does not have hydro-static elements but instead has the same elements as the airbag model within the abaqus tutorial files.

Any help and advice would be much appreciated.

Thanks.

 

[IceBreakerSours]

I am not sure if this will help but I remember that using a regular INP (part, instance, step, etc.) caused a lot of headaches whereas using a model-history type of an input file resolved the issues I was facing. I still don't know why it worked but it did.

http://www.eng-tips.com/faqs.cfm?fid=376

http://www.eng-tips.com/faqs.cfm?fid=1083

 

[akabarten]

Hi,

You can control pressure value inside fluid cavity in direct way through reference node of the cavity and 8 DOF (it is pressure).
If you want to increase pressure from 0.0 to 1.0 and then keep it constant just use *BOUNDARY and *AMPLITUDE keyword.

** 
** MODEL DATA
**
** fluid cavity definition
**
*NODE, NSET=cavity-REF-NODE
 100, 0.0, 0.0, 0.0
**
*FLUID CAVITY, NAME=cavity, REF NODE=cavity-REF-NODE,
...
**
** HISTORY DATA
**
*AMPLITUDE, NAME=pressure-AMP
** time, pressure
    0.0,      0.0
   10.0,      1.0
  100.0,      1.0
*BOUNDARY, NAME=pressure-AMP
cavity-REF-NODE, 8, 8, 1.0
**

Regards,
Bartosz