CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS

tube/tubesheet connection no convergence

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   January 11, 2016, 10:07
Exclamation tube/tubesheet connection no convergence
  #1
New Member
 
Simon1989
Join Date: Jan 2016
Posts: 1
Rep Power: 0
stsirohk is on a distinguished road
Hello everyone,
i am working on my bachelor thesis. It is about the connection between the tube and tubesheet by using high internal pressure. I have the problem that there is no convergence when increasing the pressure. It´s a weird that the model is working at a pressure of 1600 and 1700 bar but not at a pressure of 1601 ( highly distorted elements ...). If you adjust a high tangent modulus it will work for a high pressure input. But i like to do it with a tangent modulus of zero. Has anyone a solution ?


fini
/clear
/FILNAME,HYDAUFWEITEN
/PREP7

!Geometrie Eingabeparameter[mm]

dia=10 !outer radius tube
ti=1 !wall thickness tube
gap=0.1 !gap between tube and tubesheet

!Aufweitdruck
pi=2600 !pressure in bar

!Geometrie berechnete Radien

RAA=40 !outer radius tubesheet
RAI=dia/2+gap !inner radius tubesheet
RIA=dia/2 !outer radius tube
RII=dia/2-ti !inner radius tube

!Meshing
nU=50
nRP=30
nRR=3

!Model POINTS tubesheet

K,1,RAI,0,0,
K,2,RAA,0,0,
K,3,0,RAA,0,
K,4,0,RAI,0,

!Model POINTS tube

K,5,RII,0,0,
K,6,RIA,0,0,
K,7,0,RIA,0,
K,8,0,RII,0,

K,9,0,0,0,

!LINES

L,1,2
LARC,2,3,9,RAA
L,3,4
LARC,4,1,9,RAI

L,5,6
LARC,6,7,9,RIA
L,7,8
LARC,8,5,9,RII

!AREAS

AL,1,2,3,4
AL,5,6,7,8

!Element Data

et,1,plane183
et,2,CONTA175
et,3,TARGE169

!KEYOPT,2,5,1
!KEYOPT,2,9,1

! Material 1

mp,ex,1,212000
mp,nuxy,1,0.3
!tb,biso,1
!tbdata,,300,0

!Material 2

mp,ex,2,200000
mp,nuxy,2,0.3
tb,biso,2
tbdata,,268,0

!Real Konst. Target Element
r,10,RAI

!Meshing Sizing
lsel,s,,,2
lsel,a,,,4
lsel,a,,,6
lsel,a,,,8
lesiz,all,,,nU
alls

!tubesheet, radial
lesiz,1,,,nRP,10
lesiz,3,,,nRP,1/10

!tube, radial
lesiz,5,,,nRR
lesiz,7,,,nRR

!Meshing Area 1 und Materialübergabe

asel,s,area,,1
aatt,1,,1,

CM,_Y,AREA
ASEL, , , ,1
CM,_Y1,AREA
CHKMSH,'AREA'
CMSEL,S,_Y

MSHKEY,1
AMESH,_Y1
MSHKEY,0

CMDELE,_Y
CMDELE,_Y1
CMDELE,_Y2


alls


!Meshing Area 2 und Materialübergabe

asel,s,area,,2
aatt,2,,1,

CM,_Y,AREA
ASEL, , , ,2
CM,_Y1,AREA
CHKMSH,'AREA'
CMSEL,S,_Y

MSHKEY,1
AMESH,_Y1
MSHKEY,0

CMDELE,_Y
CMDELE,_Y1
CMDELE,_Y2

alls

!contact

real,10

lsel,s,,,6
nsll,,1
type,2
esurf
alls

lsel,s,,,4
nsll,,1
type,3
esurf
alls


!Boundarys and Forces

DL,1,,UY,0
DL,3,,UX,0
DL,5,,UY,0
DL,7,,UX,0



/solu

!ANTYPE,4
NLGEOM,on
NSUBST,500
kbc,0


TIME,1
SFL,8,PRES,pi*0.1
LSWRITE,1,

Time,2
SFLDELE,8,PRES
LSWRITE,2,
lssolve,1,2,1,
stsirohk is offline   Reply With Quote

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Convergence Centurion2011 FLUENT 48 June 14, 2022 23:29
problem loading UDF library in parallel cluster Veera Gutti FLUENT 8 July 26, 2016 07:24
[OpenFOAM] Paraview 3.98 - errors when saving geometry file pajot ParaView 1 September 28, 2013 10:45
Force can not converge colopolo CFX 13 October 4, 2011 22:03
Convergence of CFX field in FSI analysis nasdak CFX 2 June 29, 2009 01:17


All times are GMT -4. The time now is 15:23.