Ityp = 0

Block Format Keyword

/MAT/LAW11 - ITYP=0: Boundary Conditions Material in Flow Analysis.

Description

This law enables to model a gas inlet condition by providing data from stagnation point. Gas is supposed to be a perfect gas.

law11_ityp0

Format

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
/MAT/LAW11/mat_ID or /MAT/BOUND/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
Blank Format
Blank Format
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 (Comment 3) (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 4) = 0: > 0: (Integer)
	Perfect gas constant (Real)
Cd	Discharge coefficient (Comment 5) (Real)
fct_ID	(Optional) Function identifier for stagnation density (Comment 3) (Integer) = 0: > 0:
fct_IDp	(Optional) function identifier for stagnation pressure (Comment 3) (Integer) = 0: > 0:
	Initial stagnation pressure (Comment 3) (Real)
fct_IDT	(Optional) Function identifier for inlet temperature (Comments 3 and 6) (Integer) = 0: = 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 is used in Bernoulli theory.

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).