/MAT/LAW46 (LES

Block Format Keyword

/MAT/LAW46 - Viscous Fluid Material with Sub-grid Scale Viscosity

Description

Describes the viscous fluid material with sub-grid scale viscosity.

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/MAT/LAW46/mat_ID or /MAT/LES_FLUID/mat_ID
mat_title

c
Isgs	Cs		Csp

Field	Contents	SI Unit Example
mat_ID	Material identifier (Integer, maximum 10 digits)
mat_title	Material title (Character, maximum 100 characters)
	Initial density (Real)
	Reference density used in E.O.S (equation of state) Default (Real)
c	Speed of sound (Real)
	Molecular kinematic viscosity (Real)
Isgs	Sub-grid scale model Default = 1 (Integer) = 0: no sub-grid viscosity = 1: Smagorinsky model = 2: Smagorinsky with acoustic damping = 3: Identical to Isgs =2 with modified value
Cs	Smagorinsky constant Default = 0.1 (Real)
Csp	Pressure damping coefficient Default = Cs (Real)

#RADIOSS STARTER

#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|

/MAT/LAW46/5

FLUID (unit: kg_m_s)

# RHO_I

1562.5

# c NU

593.3 2.4e-6

# Isgs C_s Csp

2 0 0

/EULER/MAT/5

# Modif. factor.

#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|

#ENDDATA

/END

#---1----|----2----|----3----|----4----|----5----|----6----|----7----|----8----|----9----|---10----|

1.	For Isgs = 1 or 2, .

2.	For Isgs = 3, is the smallest dimension of each element.

3.	is computed as follows:

4.	This law is modified near wall boundaries:

, otherwise,

Where, is the sub grid scale viscosity, and k is the von Kahrman constant.

/MAT/LAW46 (LES_FLUID)