/PROP/TYPE15 (POROUS)

Block Format Keyword

/PROP/TYPE15 - Porous Solid Element Property Set

Description

Describes the porous solid element property set (extended Darcy's law).

Format

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
/PROP/TYPE15/prop_ID or /PROP/POROUS/prop_ID
prop_title
Blank Format
qa		qb		h
Por
R1		R2		R3
skew_IDr	Ihon
Itu			lmix
node_ID

Field	Contents	SI Unit Example
prop_ID	Property identifier (Integer, maximum 10 digits)
prop_title	Property title (Character, maximum 100 characters)
qa	Quadratic bulk viscosity Default = 10-20 (Real)
qb	Linear bulk viscosity Default = 10-20 (Real)
h	Hourglass viscosity coefficient Default = 0.10 (Real)
Por	Porosity Default = 1.0 (Real)
R1	Specific resistance factor in direction 1 Default = 0.0 (Real)
R2	Specific resistance factor in direction 2 Default = 0.0 (Real)
R3	Specific resistance factor in direction 3 Default = 0.0 (Real)
skew_IDr	Skew identifier for resistance orthotropy (Integer)
Ihon	Honeycomb substrate flag Default = 0.0 (Integer) =1: resistance applies only in direction 1 of skew_IDr and velocities are constrained in directions 2 and 3.
Itu	Turbulence imposed by medium flag (Comment 7) Default = 0.0 (Integer) = 0: turbulence is done according to model = 1: turbulence is imposed by porous model
	Turbulence coefficient for honeycomb substrate Default = 0.1 (Real)
lmix	Turbulence mixing length (Real)
node_ID	Master node identifier of rigid body modeling rigid substrate Default = 0 (Integer)

(Air)

#RADIOSS STARTER

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

/PROP/POROUS/4

AIR (unit kg_m_s)

# q_a q_b h

1E-20 1E-20 0

# Por

# R1 R2 R3

400 400 400

# skew_IDr Ihon

0 0

# Itu alpha I_mix

0 0 0

# node_ID

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

#enddata

/END

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

(Gas)

#RADIOSS STARTER

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

/PROP/POROUS/13

GAS (unit kg_m_s)

# q_a q_b h

1.1 .05 0

# Por

# R1 R2 R3

3500 0 0

# skew_IDr Ihon

3 1

# Itu alpha I_mix

1 .05 .003

# node_ID

43218

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

#enddata

/END

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

1.	The qa and qb default values are equal to 1.10 and 0.05 in non-CFD versions.

2.	Porosity (relative volume of pores) is taken into account for 3D Euler materials only. Porosity is otherwise set to 1.

3.	Force Fi = -mRij Vj is added to nodal force vector, Rij being the tension representation of the specific resistance factor in the global skew system.

4.	If all resistance factors are set to 0, no computation is performed but the grid velocity can be tied to rigid body node_ID (Line 9).

5.	Specific resistances along orthotropic axis are defined in Line 7 with respect to skew_IDr (by default global system).

6.	Relevant only if material is material law 6 with turbulence.

7.	If Itu =1, turbulence is imposed by porous model, and .

8.	Fluid reaction force vector and moment are transmitted to specified rigid body; this option is available in 3D only.

9.	Grid velocity is computed according to node_ID rigid body movement. This option is useful to impose such a movement to a grid, even for non-porous material.

/PROP/TYPE15 (POROUS)

/PROP/TYPE15 (POROUS)

/PROP/TYPE15 (POROUS)

Format

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