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surface-based fluid

surface-based fluid

surface-based fluid

(OP)

Hi,
I have tried to define a surface-based fluid cavity. The Model is a vary simple cylinder. I use the definition of the  fluid cavity from abaqus documentaion like following.

SURFCYLINDER is inner surface of the cylinder. Evry elements have the same normal vector.

*SURFACE, TYPE=ELEMENT, NAME=CAVSURF
SURFCYLINDER, SPOS
*PHYSICAL CONSTANTS, ABSOLUTE ZERO=-273.16, UNIVERSAL GAS CONSTANT=8.314
**
**FLUID CAVITY DEFINITON
**
*FLUID CAVITY, NAME=SPRING, BEHAVIOR=GAS, REF NODE=50000, SURFACE=CAVSURF, AMBIENT PRESSURE=101.36E+3

*FLUID BEHAVIOR, NAME=GAS
*MOLECULAR WEIGHT
0.044
*CAPACITY, TYPE=TABULAR
30
**

I always recieve such error when i execute abaqus input file

 ***ERROR: NO DATA CARDS PROVIDED FOR *FLUID CAVITY

Many thanks for any suggestion

issares

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