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/ALE/BCS

/ALE/BCS

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Block Format Keyword

/ALE/BCS - ALE Boundary Conditions

Description

Describes the ALE boundary conditions.

Format

(1)

(2)

(3)

(4)

(5)

(6)

(7)

(8)

(9)

(10)

/ALE/BCS/bcs_ID

bcs_title

Grilag

skew_ID

grnd_ID

 

 

 

 

 

 

 
hmtoggle_plus1Flag Definition

Field

Contents

bcs_ID

Boundary conditions block identifier

(Integer, maximum 10 digits)

bcs_title

Boundary condition block title

(Character, maximum 100 characters)

Grilag

Codes for grid velocity and Lagrange

= 0: Free DOF

= 1: Fixed DOF - the node is Lagrangian in the corresponding direction i.e. Wi = Vi.

(6 Booleans)

skew_ID

Skew identifier

(Integer)

grnd_ID

Node group to which boundary conditions are applied

(Integer)
hmtoggle_plus1Codes for Grid Velocity and Lagrange: Grilag

(1)-1

(1)-2

(1)-3

(1)-4

(1)-5

(1)-6

(1)-7

(1)-8

(1)-9

(1)-10

 

 

 

WX

WY

WZ

 

LX

LY

LZ

 

Field

Contents

WX

Code for grid velocity WX

=0: free DOF

=1: fixed DOF

(Boolean)

WY

Code for grid velocity WY

=0: free DOF

=1: fixed DOF

(Boolean)

WZ

Code for grid velocity WZ

=0: free DOF

=1: fixed DOF

(Boolean)

LX

Lagrange code WX = VX

=0: free DOF

=1: fixed DOF

(Boolean)

LY

Lagrange code WY = VY

=0: free DOF

=1: fixed DOF

(Boolean)

LZ

Lagrange code WZ = VZ

=0: free DOF

=1: fixed DOF

(Boolean)
hmtoggle_plus1Comments
1.If a node is constraint with ALE boundary conditions and classical boundary conditions (/BCS), both boundary conditions must be set is the same skew system (skew_ID).
2.The grnd_ID input is obligatory. The boundary conditions will only be applied to nodes belonging to a node group.
3.Detail input format for Grilag is shown above. The three individual codes (one per direction), must be right justified in the ten character fields used by the variable Grilag.

See Also:

Skew and Frame (/SKEW & /FRAME)

Example 6 - Fuel Tank

Example 13 - Shock Tube

Example 39 - Biomedical Valve

Example 43 - Perfect Gas Modeling with Polynomial EOS