Ityp = 0

Block Format Keyword

/MAT/B-K-EPS - ITYP=0 - Boundary Conditions Material for Flow Analysis with Turbulence

Description

This law enables to model a gas inlet condition by providing data from stagnation point. Gas is supposed to be a perfect gas. Input card is similar to /MAT/LAW11 (BOUND), but introduces two new lines to define turbulence parameters.

law11_ityp0

Format

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
/MAT/B-K-EPS/mat_ID
mat_title

Ityp		Psh		FscaleT

Ityp =0 – Gas Inlet (from stagnation point data)

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
node_IDv						Cd
fct_IDρ
fct_IDp
Blank Format
				fct_IDk	fct_IDε
cμ						Pr / Prt
fct_IDT	fct_IDQ

Field	Contents	SI Unit Example
mat_ID	Material identifier (Integer, maximum 10 digits)
mat_title	Material title (Character, maximum 100 characters)
	Initial stagnation density (Real)
	Reference density used in E.O.S (equation of state) Default (Real)
Ityp	Boundary condition type (Comment 1) (Integer) = 0: gas inlet (from stagnation point data) = 1: liquid inlet (from stagnation point data) = 2: general inlet/outlet = 3: non-reflecting boundary
Psh	Pressure shift (Comment 2) (Real)
FscaleT	(Optional) Time scale factor (Comment 3) (Real)
node_IDv	(Optional) Node identifier for velocity computation (Comment 3) (Integer) = 0: > 0:
	Perfect gas constant (Real)
Cd	Discharge coefficient (Comment 5) Default = 0.0 (Real)
fct_IDρ	Function identifier for stagnation density (Comment 3) (Integer) = 0: > 0:
fct_IDp	Function identifier for stagnation pressure (Comment 3) (Integer) = 0: > 0:
	Initial stagnation pressure (Comment 3) (Real)
	Initial turbulent energy (Real)
	Initial turbulent dissipation (Real)
fct_IDk	(Optional) Function identifier for turbulence modeling (Integer) = 0: > 0:
fct_IDε	(Optional) Function identifier for turbulence modeling (Integer) = 0: > 0:
c	Turbulent viscosity coefficient Default = 0.09 (Real)
	Diffusion coefficient for k parameter Default = 1.00 (Real)
	Diffusion coefficient for parameter Default = 1.30 (Real)
Pr / Prt	Ratio between Laminar Prandtl number (Default 0.7) and turbulent Prandtl number (Default 0.9). (Real)
fct_IDT	(Optional) Function identifier for inlet temperature (Comments 3 and 6) (Integer) = 0: T = Tadjacent = n:
fct_IDQ	(Optional) Function identifier for inlet heat flux (Comments 3 and 6) (Integer) = 0: no imposed flux = n:

1.	Provided gas state from stagnation point is used to compute inlet gas state.

A set of equations including Total Enthalpy formulation, Adiabatic Law and Equation of State allows for the complete definition of the inlet state:

2.	The PSH parameter enables shifting the output pressure which also becomes P-PSH. If using PSH=P(t=0), the output pressure will be , with an initial value of 0.0.

If no function is defined, then related quantity

remains constant and set to its initial value. However, all input quantities

can be defined as time dependent function using provided function identifiers. Abscissa functions can also be scaled using FscaleT parameter which leads to use f (Fscalet * t) instead of f(t).

4.	Inlet velocity in is used in Bernoulli theory, fixed velocity.

5.	Discharge coefficient accounts for entry loss and depends on shape orifice.

mat_bound_sharpedge

6.	With thermal modeling, all thermal data (, …) can be defined with /HEAT.

7.	It is not possible to use this boundary material law with multi-material ALE laws 37 (BIMAT) and 51 (MULTIMAT).