PHOTON USE
p;;;;;;
*rot z ang 90
set prop off
do kk=1,4
gr ou z kk
gr ou z kk x 4 8 y 1 5
enddo
msg If temperature is not being computed in this case, enter /
msg in answer to the next question about the required variable
msg
msg temperature
do kk=1,4
con tem1 z kk fi;0.001
gr ou z kk
gr ou z kk x 4 8 y 1 5
enddo
pause;con off
cl;red
msg y-direction strain
do kk=1,4
con epsy z kk fi;0.001
gr ou z kk
gr ou z kk x 4 8 y 1 5
enddo
pause;con off;red
msg x-direction strain
do kk=1,4
con epsx z kk fi;0.001
gr ou z kk
gr ou z kk x 4 8 y 1 5
enddo
pause;con off;red
msg y-direction stress
do kk=1,4
con stry z kk fi;0.001
gr ou z kk
gr ou z kk x 4 8 y 1 5
enddo
pause;con off;red
msg x-direction stress
do kk=1,4
con strx z kk fi;0.001
gr ou z kk
gr ou z kk x 4 8 y 1 5
enddo
pause;con off;red
msg displacement and velocity vectors
set prop on
* set vec ref 2
do kk=1,4
vec z kk sh
set prop off
* set vec ref 25
vec z kk x 4 8 y 1 5 sh
gr ou z kk
gr ou z kk x 4 8 y 1 5
enddo
pause;vec cl
red
set prop on
do kk=1,4
* set vec ref 2
vec z kk sh
enddo
set prop off
do kk=1,4
con p1 z kk 1 5 x 4 8 fil; 0.001
enddo
msg 'Pressure' variable in the solid
ENDUSE
>>>>>>>>>>>>>>>>>>>>>> Comment begins >>>>>>>>>>>>>>>>>>>>
DISPLAY
STRESBOX : a collection of examples of PLANT features
for stress-in-solid option.
This 3D domain comprises four variants ( one for each
Z-slab) of the problem of thermal expansion of solid
block placed in the cold stream:
IZ=1 contains simple rectangular block;
IZ=2 as above but with automatic implementation of
boundary conditions;
IZ=3 staircase cutted piece of the above and
IZ=4 has got the external pressure loaded block.
Three first three problems have got the mathematical
statements and analitical solution for solid
displacements shown below.
ENDDIS
PLANT information :
* Data input groups used: 13
* Ground groups planted : 13
* Headings used : SORC??
* Functions used : SISBC
* Commands used : None
CASE STUDY: Thermal expansion of the uniform temperature
slab with WEST and SOUTH constrained walls.
ny =0.0
1 NB
c+-------------------+
o|///////////////////|
n|///////////////////|
s|///////////////////|
t|//////// //////////|
WB r|////// T=1 ////////|EB nx =0.0
a|//////// //////////|
i|///////////////////|
n|///////////////////|
t+-c-o-n-s-t-r-a-i-n-+
X = 0 SB 5.0
Solid properties
================
Young's modulus, E = 1.0
Puasson ratio, P = 1/3
Thermoexpansion
coefficient, alfa = 1.0
Solid displacement equations
============================
d2dxx.u + d2dyy.u - ddx.p = 0
d2dxx.v + d2dyy.v - ddy.p = 0
ddx.u + ddy.v = -p/3 + 8/3 T
T = const
Solid boundary conditions
=========================
LB : ddx.u=0.333 (4 (T + nx ) + p)
ddx.v=-ddy.u
p= 2 (T - nx) - 1.5 ddy.v
HB : u=0.0
ddx.v=0.0
SB : v=0.0
ddy.u=0.0
NB : ddy.v=0.333 (4 (T + ny) + p)
ddy.u=-ddx.v
p= 2 (T - ny) - 1.5 ddx.u
Analitical solution :
=====================
p = -1.3333 (ny + nx )
u = (1.333 alfa T + 0.889 nx - 0.4444 ny ) x
v = (1.333 alfa T + 0.889 ny - 0.4444 nx ) y
Test case
=========
Uniform heating.
Cartesian geometry.
Uniform grid.
Fixed stiffness = 1.0 N/m**2
Fixed expansivity = 1.0
Fixed solid temp. = 1.0 k
Poisson ratio = 0.3333
Material constrained at east x
Zero normal stress apllied to material at north y
begin
Displacements of solid in x-direction should be:
IX 3 4 5 6 7
U1 0.000E+00 1.33333 2.66667 4.0000 5.33333
Displacements of solid in y-direction should be:
IY 1 2 3 4 5
V1 1.33333 2.66667 4.00000 5.333333 6.666666
end
<<<<<<<<<<<<<<<<<<<<<<< Comment ends <<<<<<<<<<<<<<<<<<<<<
TEXT(2dxy uniform heating.
** Declaration
BOOLEAN(CALSTR)
INTEGER(IYNORT,IXWES,IXEA,IXFIX)
REAL(WIN,POISSN,TIN,TBODY)
REAL(EXCOLI,EXCOC1,EXCOC2,STIFFN,STIFC1,STIFC2,DSTRSE,DSTRSN,DSTRSW)
READQ1=T
STRA=T;CALSTR=T
** Setting defaults
* Inlet velocity, inlet and body temperatures
WIN=1.0;TIN=0.0;TBODY=1.0
* Constant linear thermal-expansion coefficient, excoli > 0
EXCOLI=1.e-05
* Constant Young's modulus (stiffness)
STIFFN=1.e5
* Consant Poiison ratio
POISSN= 0.3333
* Direct stresses on high, north and low surfaces
DSTRSE=0.0
DSTRSN=0.0
DSTRSW=0.0
** Grid settings
NZ=4
IYNORT=5;NY=8;IXWES=4;NX=10;IXEA=NX-2;IXFIX=IXWES-1
ZWLAST=NZ
YVLAST=NY ; XULAST=NX
+ GRDPWR(X,NX,XULAST,1.0)
+ GRDPWR(Y,NY,YVLAST,1.0)
+ GRDPWR(Z,NZ,ZWLAST,1.0)
** Solution data
* Solve for P1 by whole-field method
SOLUTN(P1,Y,Y,Y,N,N,N)
SOLVE(V1);SOLUTN(V1,Y,Y,N,N,N,Y)
SOLVE(U1);SOLUTN(U1,Y,Y,N,N,N,Y)
SOLVE(TEM1);SOLUTN(TEM1,Y,Y,Y,N,N,Y)
* Store variables
STORE(W1)
STORE(HPOR,PRPS,MARK)
OUTPUT(PRPS,N,N,N,N,N,N)
ISOLX=0;ISOLY=0;ISOLZ=0
* Terms for temperature
TERMS(TEM1,N,Y,Y,Y,Y,Y)
** GROUP 9. Properties of the medium (or media).
;ENUL=0.01
PRNDTL(TEM1)=CONDFILE
** GROUP 11. Initialization of fields of variables
INIADD=F
FIINIT(P1)=1.0;FIINIT(U1)=0.0;FIINIT(V1)=0.0;FIINIT(W1)=0.0
FIINIT(HPOR,MARK)=0.0
* working fluid is air
FIINIT(PRPS)=0.0
* Initialize Temperature and density (to air density) Field
FIINIT(TEM1)=TIN
** GROUP 13. Boundary conditions and special sources
* inlet boundary condition, name INLET (at WEST)
PATCH(INLET,WEST,1,1,1,IYNORT,1,NZ,1,LSTEP)
COVAL(INLET,P1,FIXFLU,1.2*WIN);COVAL(INLET,U1,ONLYMS,WIN)
COVAL(INLET,TEM1,ONLYMS,TIN)
* outlet boundary condition, name EXIT (at EAST)
PATCH(EXIT,EAST,NX,NX,1,NY,1,NZ,1,LSTEP)
COVAL(EXIT,P1,1.0,0.0)
COVAL(EXIT,TEM1,ONLYMS,SAME)
* wall boundary conditions on north, south, low and high walls
PATCH(NSIDE,NWALL,1,NX,NY,NY,1,NZ,1,LSTEP)
COVAL(NSIDE,U1,1.0,0.0)
PATCH(SSIDE,SWALL,IXWES,IXEA,IYNORT+1,IYNORT+1,1,NZ,1,LSTEP)
COVAL(SSIDE,U1,1.0,0.0)
+ PATCH(ESIDE,WWALL,IXEA+1,IXEA+1,1,IYNORT,1,NZ,1,LSTEP)
+ COVAL(ESIDE,V1,1.0,0.0)
+ PATCH(WSIDE,EWALL,IXFIX,IXFIX,1,IYNORT,1,NZ,1,LSTEP)
+ COVAL(WSIDE,V1,1.0,0.0)
** Once-for-all-slabs settings
* Body properties are those of steel for rectangular
blocks at IZ=1 and 2.
PATCH(BODZ12,INIVAL,IXWES,IXEA,1,IYNORT,1,2,1,1)
INIT(BODZ12,PRPS,0.0,111.0)
* Body properties and mark values are those of steel for
staircase blocks at IZ=3.
PATCH(BODY1,INIVAL,4,8,1,1,1,NZ,1,1)
INIT(BODY1,PRPS,0.0,111.0)
INIT(BODY1,MARK,0.0,111.0)
PATCH(BODY2,INIVAL,4,8,2,2,1,NZ,1,1)
INIT(BODY2,PRPS,0.0,111.0)
INIT(BODY2,MARK,0.0,111.0)
PATCH(BODY3,INIVAL,4,6,3,3,1,NZ,1,1)
INIT(BODY3,PRPS,0.0,111.0)
INIT(BODY3,MARK,0.0,111.0)
PATCH(BODY4,INIVAL,4,5,4,4,1,NZ,1,1)
INIT(BODY4,PRPS,0.0,111.0)
INIT(BODY4,MARK,0.0,111.0)
PATCH(BODY5,INIVAL,4,5,5,5,1,NZ,1,1)
INIT(BODY5,MARK,0.0,111.0)
INIT(BODY5,PRPS,0.0,111.0)
* Body properties are those of steel for rectangular
block at IZ=4.
PATCH(BODZ4,INIVAL,IXWES,IXEA,1,IYNORT,NZ,NZ,1,1)
INIT(BODZ4,PRPS,0.0,111.0)
* Heat-source boundary conditions
PATCH(HOT12,CELL,IXWES,IXEA,1,IYNORT,1,2,1,LSTEP)
COVAL(HOT12,TEM1,FIXVAL,TBODY)
PATCH(HOT4,CELL,IXWES,IXEA,1,IYNORT,NZ,NZ,1,LSTEP)
COVAL(HOT4,TEM1,FIXVAL,TBODY)
** Once-for-three-slabs settings
* fix displacement at ix=IXFIX to zero
PATCH(FIXED,EAST,IXFIX,IXFIX,1,IYNORT,1,3,1,LSTEP)
COVAL(FIXED,U1,FIXVAL,0.0)
** Case 1 (IZ=1) :Thermal expansion of the block
---------------------------------------------
* direct-stress condition on the north face of body
PATCH(NDRSTR,NORTH,IXWES,IXEA,IYNORT,IYNORT,1,1,1,LSTEP)
COVAL(NDRSTR,V1,FIXFLU,DSTRSN*(1.+POISSN))
* direct-stress condition on the east face of body
PATCH(EDRSTR,EAST,IXEA,IXEA,1,IYNORT,1,1,1,LSTEP)
COVAL(EDRSTR,U1,FIXFLU,DSTRSE*(1.+POISSN))
** Case 2 (IZ=2) : As Case 1 but with automatic setting of
zero-stress boundary conditions
-------------------------------
NAMSAT=MOSG
PLANTBEGIN
INTEGER(IYNORT,IXWES,IXEA,IXFIX)
IYNORT=5;IXWES=4;IXEA=NX-2;IXFIX=IXWES-1
* north face of body
PATCH(NSISBC,NORTH,IXWES,NX,1,NY,2,2,1,LSTEP)
CO =SISBC(FIXFLU)
VAL=SISBC(0.0)
COVAL(NSISBC,V1,GRND,GRND)
* east face of body
PATCH(ESISBC,EAST,IXWES,NX,1,NY,2,2,1,LSTEP)
CO =SISBC(FIXFLU)
VAL=SISBC(0.0)
COVAL(ESISBC,U1,GRND,GRND)
>>>>>>>>>>>>>>>>>>>>>> Comment begins >>>>>>>>>>>>>>>>>>>>
SISBC function is used to introduce zero-normal stress
boundary conditions at the solid fluid interface.
<<<<<<<<<<<<<<<<<<<<<<< Comment ends <<<<<<<<<<<<<<<<<<<<<
** Case 3 (IZ=3) : Thermal expansion of staircase block
----------------------------------------------------
* Heat-source boundary conditions
PATCH(SS111H,CELL,1,NX,1,NY,1,NZ,1,LSTEP)
CO=1.e10
VAL=:TBODY:
COVAL(SS111H,TEM1,GRND,GRND)
* direct-stress condition on east face of body
PATCH(SS111NOR,NORTH,1,NX,1,NY,NZ,NZ,1,LSTEP)
CO =SISBC(FIXFLU)
VAL=SISBC(0.0/FIXFLU)
COVAL(SS111NOR,V1,GRND,GRND)
* direct-stress condition on east face of body
PATCH(SS111EAS,EAST,1,NX,1,NY,NZ,NZ,1,LSTEP)
CO =SISBC(FIXFLU)
VAL=SISBC(0.0/FIXFLU)
COVAL(SS111EAS,U1,GRND,GRND)
>>>>>>>>>>>>>>>>>>>>>> Comment begins >>>>>>>>>>>>>>>>>>>>
SISBC function is used to introduce automatically
(guided by PRPS distribition ) zero-normal stress
boundary conditions at the solid 111 -fluid interface as
indicated by the PATCH name SS111??.
<<<<<<<<<<<<<<<<<<<<<<< Comment ends <<<<<<<<<<<<<<<<<<<<<
** Case 4 (IZ=4) : Pressure loaded block
-------------------------------------
* on west face of body
PATCH(WFACE,EAST,IXWES-1,IXWES-1,1,IYNORT,NZ,NZ,1,LSTEP)
VAL=P1/:STIFFN:
COVAL(WFACE,U1,FIXFLU,GRND)
* on north face of body
PATCH(NFACE,NORTH,IXWES,IXEA,IYNORT,IYNORT,NZ,NZ,1,LSTEP)
VAL=-NORTH(P1)/:STIFFN:
COVAL(NFACE,V1,FIXFLU,GRND)
* on east face of body
PATCH(EFACE,EAST,IXEA,IXEA,1,IYNORT,NZ,NZ,1,LSTEP)
VAL=-P1[+1,,]/:STIFFN:
COVAL(EFACE,U1,FIXFLU,GRND)
>>>>>>>>>>>>>>>>>>>>>> Comment begins >>>>>>>>>>>>>>>>>>>>
The external fluid pressures are used above as normal
stress conditons at the solid boundaries.
<<<<<<<<<<<<<<<<<<<<<<< Comment ends <<<<<<<<<<<<<<<<<<<<<
PLANTEND
* fix displacement at the west body base to zero
PATCH(BASE,EAST,IXWES-1,IXEA,1,1,NZ,NZ,1,LSTEP)
COVAL(BASE,U1,FIXVAL,0.)
** Special data
SPEDAT(SET,STRAIN,CALSTR,L,:CALSTR:)
SPEDAT(SET,STRAIN,POISSN,R,:POISSN:)
SPEDAT(SET,STRAIN,EXCOLI,R,:EXCOLI:)
SPEDAT(SET,STRAIN,STIFFN,R,:STIFFN:)
** Solution criteria
* GROUP 16. Termination criteria for inner iterations.
LITER(TEM1)=10;ENDIT(TEM1)=1.E-20
LITER(P1)=20;LITER(U1)=1;LITER(V1)=1;LITER(W1)=1
SELREF=T;RESFAC=1.E-6
LSWEEP=150 ; TSTSWP=-1
* GROUP 17. Under-relaxation and related devices.
RELAX(P1,LINRLX,0.8)
** Output data
* GROUP 21. Frequency and extent of field printout.
Storage & output, for stress and strain calculation.
IXPRF=3;IXPRL=9;IYPRL=6
+ STORE(EPSY,STRY)
+ OUTPUT(EPSY,Y,N,N,N,N,N) ; OUTPUT(STRY,Y,N,N,N,N,N)
+ FIINIT(EPSY)=0.0;FIINIT(STRY)=0.0
+ STORE(EPSX,STRX)
+ OUTPUT(EPSX,Y,N,N,N,N,N) ; OUTPUT(STRX,Y,N,N,N,N,N)
+ FIINIT(EPSX)=0.0;FIINIT(STRX)=0.0
+ STORE(EPST) ; OUTPUT(EPST,Y,N,N,N,N,N);FIINIT(EPST)=0.0
OUTPUT(P1,Y,Y,Y,Y,Y,Y)
OUTPUT(PRPS,N,N,N,N,N,N)
* GROUP 22. Location of spot-value & frequency of
residual printout.
* Assign cell-indices of spot-point monitoring location
IZMON=1;IYMON=IYNORT-1;IXMON=(IXWES+IXEA)/2
nxprin=1;nyprin=1;nzprin=1
* GROUP 23. Variable-by-variable field printout and plot
and/or tabulation of spot-values and residuals.
NPRINT=LSWEEP
dmpstk=t
stop