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Pressure coefficients

Pressure coefficients

Pressure coefficients

(OP)
Hi all,
I would like to determine pressure coefficients on a building with flat roof and compare them with values in Eurocode. The standard establish on the windward side of the building pressure +0,77 and on the leeward side suction with value -0,45.
But the calculated results are much greater that in EC.
What should be the problem??

Thanks a lot,
Robert  

!/FILNAME,RO_triangular,0
!/CWD,'E:\ANSYS\RO_triangular mesh'
!/TITLE,Rectangular object-triangular meshing
aa=5
bb=3
cc=5
/prep7
k,1,0,0,0        !node definitions
k,2,0,4*bb,0
k,3,0,0,3*cc
k,4,0,4*bb,3*cc
k,5,6*aa,0,0
k,6,6*aa,4*bb,0
k,7,6*aa,0,3*cc
k,8,6*aa,4*bb,3*cc
k,9,-3*aa,0,-6*cc
k,10,-3*aa,12*bb,-6*cc
k,11,-3*aa,0,6*cc
k,12,-3*aa,12*bb,6*cc
k,13,9*aa,0,-6*cc
k,14,9*aa,12*bb,-6*cc
k,15,9*aa,0,6*cc
k,16,9*aa,12*bb,6*cc
v,9,10,12,11,13,14,16,15    !volume definitions
v,1,2,4,3,5,6,8,7
VSBV,       1,       2      !substracting volumes
ET,1,FLUID142            !element type
MPTEMP,,,,,,,,          !material properties
MPTEMP,1,0  
MPDATA,DENS,1,,1.25
MPTEMP,,,,,,,,  
MPTEMP,1,0  
MPDATA,VISC,1,,1.79e-005
LESIZE,ALL, , ,15, ,1, , ,1,    !element size selection
MSHKEY,0            !mesh generation
MSHAPE,1,3d
CM,_Y,VOLU  
VSEL, , , ,       3
CM,_Y1,VOLU
CHKMSH,'VOLU'   
CMSEL,S,_Y  
!*  
VMESH,_Y1   
!*  
CMDELE,_Y   
CMDELE,_Y1  
CMDELE,_Y2  
da,all,vx,0,1        !boundary conditions on areas
da,all,vy,0,1
da,all,vz,0,1
dadele,2,all
da,1,vz,-26,1
da,3,vz,-26,1
da,4,vz,-26,1
da,6,vz,-26,1
da,2,pres,0,1
FLDATA1,SOLU,FLOW,1
FLDATA1,SOLU,TURB,1
FLDATA1,SOLU,RDSF,1
FLDATA2,ITER,EXEC,50,
FLDATA5,OUTP,RESI,1
FLDATA7,PROT,DENS,AIR-SI
FLDATA8,NOMI,DENS,-1
FLDATA7,PROT,VISC,AIR-SI
FLDATA8,NOMI,VISC,-1
FLDATA24,TURB,MODL,1
FLDATA24,TURB,CMU,0.09,
FLDATA24,TURB,C1,1.44,  
FLDATA24,TURB,C2,1.92,  
FLDATA24,TURB,SCTK,1,   
FLDATA24,TURB,SCTD,1.3,

FLDATA24,TURB,ININ,0.01,
FLDATA24,TURB,INSF,0.01,
FLDATA24,TURB,RATI,1000000,     !higher turbulence value
FLDATA24,TURB,SCTT,0.85,
FLDATA24,TURB,SCTM,1,   

FLDATA34,MIR,MOME,0.2,           !matrix has a negative diagonal problem solution
FLDATA34,MIR,TEMP,0.2,  
FLDATA34,MIR,TURB,0.2,  

FINISH  
/SOL
SOLVE   

FLDATA24,TURB,ININ,0.01,
FLDATA24,TURB,INSF,0.01,
FLDATA24,TURB,RATI,1000,    !default turbulence value
FLDATA24,TURB,SCTT,0.85,
FLDATA24,TURB,SCTM,1,   
!*  
/COM,,Steady State Analysis,0   
FLDATA2,ITER,EXEC,100,      !100 iterations
FLDATA2,ITER,OVER,0,
FLDATA2,ITER,APPE,0,
FLDATA3,TERM,VX,0.01,   
FLDATA3,TERM,VY,0.01,   
FLDATA3,TERM,VZ,0.01,   
FLDATA3,TERM,PRES,1e-008,   
FLDATA3,TERM,TEMP,1e-008,   
FLDATA3,TERM,ENKE,0.01,
FLDATA3,TERM,ENDS,0.01,
FLDATA5,OUTP,SUMF,10,   
!*  
FLDATA5,OUTP,PTOT,1
FLDATA5,OUTP,TTOT,0
FLDATA5,OUTP,HFLU,0
FLDATA5,OUTP,HFLM,0
FLDATA5,OUTP,STRM,1
FLDATA5,OUTP,PCOE,1         !pressure coefficient output    
FLDATA5,OUTP,MACH,0
FLDATA5,OUTP,YPLU,0
FLDATA5,OUTP,TAUW,0
FLDATA5,OUTP,RDFL,0
SOLVE   
FINISH  
/POST1  
SET,LAST
wpstyle,15,5,0,60,0.001,0,1,,5
wpro,,,-90.000000   
wpof,,,-15.000000
WPSTYLE,,,,,,,,0
/EFACET,1   
PLNSOL, PCOE,, 0
/GRAPHICS,POWER
/TYPE,1,8   
/CPLANE,1   
/SHADE,1,1  
/HBC,1,0
/REPLOT


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