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Keyword factor THM_DIFFU

Dans le document Operator DEFI_MATERIAU Code_Aster (Page 107-112)

9.6.2 Operand CP

CP = CP

Specific heat with constant pressure of the dissolved air.

9.6.3 Operand COEF_HENRY

COEF_HENRY = H

Constant of Henry

K

H, function of the temperature, allowing to connect the molar concentration of dissolved air Cadol (

moles / m

3) with the air pressure dryness:

C

adol

= p

as

K

H

9.7 Keyword factor THM_DIFFU

Obligatory for all behaviors THM (cf [R7.01.11]). The user must make sure of the coherence of the functions and their derivative.

9.7.1 Syntax

| THM_DIFFU = _F (

♦ R_GAZ = rgaz, [R]

♦ RHO = rho, [R]

◊ CP = CP, [R]

◊ BIOT_COEF = organic, [R]

◊ BIOT_L = biol, [R]

◊ BIOT_N = bion, [R]

◊ BIOT_T = biot, [R]

♦ PESA_X = px, [R]

♦ PESA_Y = py, [R]

♦ PESA_Z = pz, [R]

◊ PESA_MULT = fpesa, [function]

◊ PERM_IN = leave, [function]

◊ PERMIN_L = perml, [function]

◊ PERMIN_T = permn, [function]

◊ PERMIN_N = permt, [function]

◊ SATU_PRES = sp, [function]

◊ D_SATU_PRES = dsp, [function]

◊ PERM_LIQU = perml, [function]

◊ D_PERM_LIQU_SATU = dperm, [function]

◊ PERM_GAZ = permg, [function]

◊ D_PERM_SATU_GAZ = dpsg , [function]

◊ D_PERM_PRES_GAZ = dppg , [function]

◊ VG_N = vgn, [R]

◊ FICKA_T = conceited, [function]

◊ FICKA_PA = /fapv, [function]

◊ LAMB_CT = /lambct, [function ◊ LAMB_C_T = /lambctt, [function]

Warning : The translation process used on this website is a "Machine Translation". It may be imprecise and inaccurate in whole or in part and is

◊ EMMAG = EM, [R]

For the hydraulic behaviors homogenized density.

CP = CP

For the thermal behaviors specific heat with constant constraint of the solid alone.

BIOT_COEF = organic Coefficient of Biot.

9.7.3 Operands BIOT_L/BIOT_T/BIOT_N

Replace BIOT_COEF in the anisotropic case. For the definition of the plans of isotropy one will refer to 3.4 and 3.5. In the case of the transverse isotropy (3D), BIOT_L and BIOT_T are respectively the coefficients of Biot in the directions L and NR (perpendicular to the plan of isotropy). In the orthotropic case in 2D, one will define the coefficients of Biot in the three directions L, T, NR: PERMIN_L, PERMIN_T and PERMIN_T.

9.7.4 Operands SATU_PRES/D_SATU_PRES

For the unsaturated material behaviors (LIQU_VAPE_GAZ, LIQU_AD_GAZ_VAPE, LIQU_GAZ, LIQU_GAZ_ATM).

SATU_PRES = sp

Isotherm of saturation function of the capillary pressure.

D_SATU_PRES= dsp

Derived from saturation compared to the pressure.

Temporal function in factor of the components of gravity PESA_X, PESA_Y and PESA_Z. Optional, it is by default constant and equal to 1.

9.7.6 Operand PERM_IN

Intrinsic permeability: function of porosity (in the isotropic case). In the studies, the dependence of the intrinsic permeability to  can express itself classically by the following cubic law:

k 

k

0

=

si −

0

0 : 1

si 0−

0

10

−2

: 1 −

0

3

si 10

−2

−

0

: 1∗10

−6

Other laws are of course possible.

The permeability to the classical direction

K

, of which dimension is that a speed is calculated in the following way:

K = K

int

K

rel

 

l

g

where

K

int is the intrinsic permeability,

K

rel the relative permeability,  viscosity, l density of the liquid and

g

the acceleration of gravity.

K

int is in fact a diagonal tensor, in the isotropic case its three components are equal to the well informed value.

9.7.7 Operands PERMIN_L/PERMIN _T/PERMIN _N

For the definition of the plans of isotropy one will refer to 3.4 and 3.5. In the case of the transverse isotropy (3D), PERMIN_L and PERMIN_T are respectively the intrinsic permeabilities in the directions L and NR (perpendicular to the plan of isotropy). In the orthotropic case in 2D, one will define the permeabilities in the plans L and T : PERMIN_L and PERMIN_T.

9.7.8 Operands PERM_LIQU/D_PERM_LIQU_SATU

Permeability and derived from the permeability relating to the liquid: function of saturation.

9.7.9 Operands PERM_GAZ/D_PERM_SATU_GAZ

Permeability and derived from the permeability relating to gas: function of the saturation and the gas pressure.

9.7.10 Operands VG_N/VG_PR/VG_SR

For the unsaturated material behaviors (LIQU_VAPE_GAZ, LIQU_AD_GAZ_VAPE, LIQU_GAZ, LIQU_GAZ_ATM)and if the hydraulic law is HYDR_VGM or HYDR_VGC (see Doc. U4.51.11), indicate respectively parameters

N

,

Pr

, and

Sr

law of Mualem Van-Genuchten being used to define the capillary pressure and the permeabilities relating to water and gas.

9.7.11 Operands VG_SMAX/VG_SATUR

For the unsaturated material behaviors (LIQU_VAPE_GAZ, LIQU_AD_GAZ_VAPE, LIQU_GAZ, LIQU_GAZ_ATM) and if the hydraulic law is HYDR_VGM or HYDR_VGC (see document [U4.51.11]).

VG_SMAX = smax

indicate the maximum saturation for which one applies the law of Mualem Van-Genuchten. Beyond this saturation the curves of Mualem-Van Genuchten are interpolated (see document [R7.01.11]). This value must be very close to 1.

VG_SATUR = stur

Beyond the saturation defined by VG_SMAX, saturation is multiplied by this corrective factor. This value must be very close to 1 (see document [R7.01.11]).

9.7.12 Operands D_PERM_PRES_GAZ

Derived from the permeability to gas by report has the gas pressure: function of the saturation and the gas pressure.

9.7.13 Operands FICKV_T/FICKV_S/FICKV_PG/FICKV_PV

For the behaviors LIQU_VAPE_GAZ and LIQU_AD_GAZ_VAPE, coefficient of Fick function of the temperature for the diffusion of the vapor in the gas mixture. The coefficient of Fick which can be a function of saturation, the temperature, the pressure of gas and the steam pressure, one defines it as a product of 4 functions: FICKV_T, FICKV_S, FICKV_PG, FICKV_VP. In the case of LIQU_VAPE_GAZ and LIQU_AD_GAZ_VAPE, only FICKV_T is obligatory.

Warning : The translation process used on this website is a "Machine Translation". It may be imprecise and inaccurate in whole or in part and is

9.7.14 Operands D_FV_T/D_FV_PG

For the behaviors LIQU_VAPE_GAZ and LIQU_AD_GAZ_VAPE.

Dérivée of the coefficient FICKV_T compared to the temperature.

Derived from the coefficient FICKV_PG compared to the gas pressure.

9.7.15 Operands FICKA_T/FICKA_S/FICKA_PA/FICKA_P

For the behavior LIQU_AD_GAZ_VAPE, coefficient of Fick function of the temperature for the diffusion of the air dissolved in the liquid mixture. The coefficient of Fick which can be a function of saturation, the temperature, the dissolved air pressure and the pressure of liquid, one defines it as a product of 4 functions: FICKA_T, FICKA_S, FICKV_PA, FICKV_PL. In the case of LIQU_AD_GAZ_VAPE, only FICKA_T is obligatory.

9.7.16 Operand D_FA_T

For the behavior LIQU_AD_GAZ_VAPE, derived from the coefficient FICKA_T compared to the temperature.

9.7.17 Operands LAMB_T/LAMB_S/LAMB_PHI/LAMB_CT

LAMB_T = lambt

Multiplicative part of the thermal conductivity of the mixture depend on the temperature (cf [R7.01.11]). This operand is obligatory in the case of modeling with thermics.

LAMB_S = lambs , LAMB_PHI = lambp

Multiplicative part (to 1 by default equalizes) thermal conductivity of the mixture depending respectively on saturation, of porosity.

LAMB_CT = lambct

Part of the thermal of the constant mixture and additive conductivity (confer [R7.01.11]). This constant is equal to zero by default.

9.7.18 Operands LAMB_TL/LAMB_TN/LAMB_TOUT

Replace LAMB_T in the anisotropic case. In the case of the transverse isotropy (3D), LAMB_TL and LAMB_TT are respectively conductivities in the directions L and NR (perpendicular to the plan of isotropy). In the orthotropic case in 2D, one will define conductivities in the plans L and T : LAMB_TL and LAMB_TN.

9.7.19 Operands LAMB_C_L/LAMB_C_N/LAMB_C_T

Replace LAMB_CT in the anisotropic case. In the case of the transverse isotropy (3D), LAMB_C_L and LAMB_C_T are respectively conductivities in the directions L and NR (perpendicular to the plan of isotropy). In the orthotropic case in 2D, one will define conductivities in the plans L and T : LAMB_C_L and LAMB_C_N.

9.7.20 Operands D_LB_T/D_LB_S/D_LB_PHI

D_LB_T = dlambt

Derived from the part of thermal conductivity of the mixture depend on the temperature compared to the temperature.

D_LB_S = dlambs, D_LB_PHI = dlambp

Derived from the part of thermal conductivity of the mixture depending respectively on saturation, porosity.

9.7.21 Operands D_LB_TL/D_LB_TN/D_LB_TOUT

In the anisotropic case, derived compared to the temperature from respectively LAMB_TL, LAMB_TN and LAMB_TT.

9.7.22 Operand EMMAG

Coefficient of storage. This coefficient is taken into account only in the cases of modeling without mechanics. It connects the variation of porosity to the variation of pressure of liquid.

9.7.23 Operand PERM_END

Permeability function of the damage, used by the mechanical behaviors with damage.

Dans le document Operator DEFI_MATERIAU Code_Aster (Page 107-112)

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