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Basic pipe52 model

The input to this model can be found in the example folder, under case E001.

A short section of flexible pipe is exposed to:

  • tension

  • external and internal pressure

  • curvature; applied by rotation of the two model ends

E001 model
Figure 1. Bflex model

Model description

The model, see Figure 1, consist of thermal layers, carcass and zeta spiral that are specified based on the cross sectional area and with no detailed geometry. This is obtained by use of ccode manual in the flexcross description:

#            NAME     TYPE       IFRIC  DISFAC  FORFAC  GEOFAC  ENDFAC  ID         TIMEINI  ITCODE   ILAEXT  IELBFL  FIMOD  CONTDEN  NELGR  EL1GRP   EL2GRP       EL3GRP        
CROSSECTION  NYEMAT   FLEXCROSS  2      1000    2       0       0.0     0.1524*E3  1        31      14          1       0.0    0.0      3      NYECORE  NYETENSILE1  NYETENSILE2
# CTYPE  THK         MATNAME      FRIC   LAY-ANG   RNUM  TEMP  MATNAME_NL  CCODE     CFATFL  AREA       IT  INY  IRKS  WIDTH
CARC     6.0000E-00  CARCMAT      0.15   88.1153   1     0.00  none        MANUAL    NONE    0.456E+02  0   0    0     0    
THER     1.1940E-00  THERMAT      0.15   0.0000    0     0.00  none        NONE      NONE    0          0   0    0     0    
THER     6.5000E-00  THERMAT      0.15   0.0000    0     0.00  none        NONE      NONE    0          0   0    0     0    
ZETA     1.0000E+01  ZETAMAT      0.15   88.9395   1     0.00  none        MANUAL    NONE    0.950e+02  0   0    0     0    
THER     2.6667E-01  THERMAT      0.15   0.0000    0     0.00  none        NONE      NONE    0          0   0    0     0    
THER     9.4340E-01  THERMAT      0.15   0.0000    0     0.00  none        NONE      NONE    0          0   0    0     0    
TENS     5.0000E-00  TENSMAT      0.15   30.2774   40    0.00  none        TENSILE1  SNTENS  0          0   0    0     0    
THER     9.4340E-01  THERMAT      0.15   0.0000    0     0.00  none        NONE      NONE    0          0   0    0     0    
THER     2.5000E-01  THERMAT      0.15   0.0000    0     0.00  none        NONE      NONE    0          0   0    0     0    
TENS     5.0000E-00  TENSMAT      0.15   -30.6543  42    0.00  none        TENSILE2  SNTENS  0          0   0    0     0    
THER     1.9029E-00  THERMAT      0.15   0.0000    0     0.00  none        NONE      NONE    0          0   0    0     0    
THER     6.0000E-00  THERMAT      0.15   0.0000    0     0.00  none        NONE      NONE    0          0   0    0     0    
THER     3.8835E-01  THERMAT      0.15   0.0000    0     0.00  none        NONE      NONE    0          0   0    0     0    
THER     6.0000E-00  THERMAT      0.15   0.0000    0     0.00  none        NONE      NONE    0          0   0    0     0
Set timeini to a time after the axial load has been applied, but before bending is initiated. In the present case full load is applied from the start, and bending is initiated from time 2. timeini 1.0 will then be the proper choise.
When manual is used for the pressure spirals (carcasss and zeta), postprocessing to the old bflex format and further processing by boundary and pflex can not be performed.

Results

The curvature profile is obtained by glplot from bflex2010post, and shown at maximum curvature in Figure 2.

E001 curvature
Figure 2. Curvature profile
A curvature variation can be observed over the pipe length. One should be careful to keep the model length sufficiently small relative to the tension load, so that the representative curvature is obtained.

Relevant files

Go to bflex2010 file

Go to bflex2010post file

User manual for reference

Processing of files from command line

  • bflex2010 -n bflex2010_01

  • bflex2010post -n bflex2010post_01

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