I want to creat a geometry of a tapered pipe and I wan t to just simulate one quarter of the pipe.But I don't want the model have some cells which are not the hexahedrons,so how can I create such a geometry?

Thank you very much for your help!

Lee

If R0 is your larger pipe radius, R1 is the smaller radius, and Z is the length, I would do this:

V 1 0 0 0

V 2 R0 0 0

CSYS 2

VGEN 5 1 2 2 1 0 22.5 0

CSYS 1

V 7 R0 / 2 R0 / 2 0

V 8 R0 / 2 0 0

V 9 0 R0 / 2 0

VGEN 2 100 1 100 1 0 0 Z

CSYS 2

VSCA 101 200 1 R1 / R0

CSYS 1

SPL 1 VRAN 2 6 1

SPL 2 VRAN 102 106 1

BLK 1 1 8 7 9 101 108 107 109

BLK 2 8 2 4 7 108 102 104 107

BLK 3 9 7 4 6 109 107 104 106

BLKF 1 10 10 20

BLKF 2 10 10 20

BLKF 3 10 10 20

BLKE 1 3

VMERG ALL

Change the 10's and 20's in the BLKF commands to the number of cells you want.

Good luck.

Thank you very much,Brian!