Users:Geometry Generation/Design BRep Elements

Design BRep elements are based on NURBS entities in the parameter space of another NURBS patch.

Contents 1 Input Parameters 1.1 Parameter Description 2 Coupling 2.1 Example of a Complete Input Block 3 Boundary Conditions 3.1 Example of a Complete Input Block 4 Structural Elements 4.1 Example of a Complete Input Block

Input Parameters

The block has to be initialized by DE-BREP-NURBS. Every design brep element starts with DE-BREP-EL. This is followed by the ID, the corresponding part and property.

Parameter Description

Compulsory Parameters
Parameter	Values, Default(*)	Description
Element type	DE-BREP-EL	Element type = design boundary
ID	int	ID of the design boundary element
PART	int	Part ID of the design boundary element
PROP	int	Property ID of the design boundary element
NURBS_TOP	PATCH_PAR int1 OF DE-EL int2 DE-EL int DE-BREP int	NURBS_PATCH_PAR int1 of NURBS_TOP of Design element int2 NURBS_TOP of Design element int NURBS_TOP of Design boundary element int
Optional Parameters
Parameter	Values, Default(*)	Description
TOL	TOL = float	allowed distance between master and slave point
LOC	[ float ]	position on a curve
	[ float float ]	position on a surface interval on a curve

Coupling

Additional coupling quantities are the allowed tolerance between master and slave gauss point and the range/location on the NURBS patch.

Example of a Complete Input Block

!===================================================================
!             ID  PART  PROP   NURBS_TOP
DE-BREP-NURBS
  ! coupling
  DE-BREP-EL   1   1   4    PATCH_PAR  1  OF   DE-EL  1 PATCH_PAR 5 OF DE-EL 2 TOL=0.1 [0 10][0 10]			!coupling on an interval: brep edge - brep edge
  DE-BREP-EL   2   1   4    PATCH_PAR  1  OF   DE-EL  1 DE-EL 2 TOL=0.1 [0 10][0 10]					!coupling on an interval: brep edge - design element 1D
  DE-BREP-EL   3   1   4    DE-EL  1 DE-EL 2 TOL=0.1 [0 10][0 10]							!coupling on an interval: design element 1D - design element 1D
  DE-BREP-EL   4   1   4    DE-BREP  1 DE-EL 2 TOL=0.1 [0 10][0 10]							!coupling on an interval: designboundary ( = brep edge) - design element 1D
  DE-BREP-EL   5   1   4    DE-BREP  1 DE-BREP 2 TOL=0.1 [0 10][0 10]							!coupling on an interval: designboundary ( = brep edge) - designboundary ( = brep edge)
  DE-BREP-EL   6   1   5    PATCH_PAR  1  OF   DE-EL  1 PATCH_PAR 5 OF DE-EL 2 TOL=0.1 [0.0][0.0]			!coupling of a point: brep edge - brep edge
  DE-BREP-EL   7   1   5    PATCH_PAR  1  OF   DE-EL  1 DE-EL 2 TOL=0.1 [0.0][0.0]					!coupling of a point: brep edge - design element 1D
  DE-BREP-EL   8   1   5    DE-EL  1 DE-EL 2 TOL=0.1 [0 10][0 10]							!coupling of a point: design element 2D - design element 2D
  DE-BREP-EL   9   1   5    DE-EL  1 DE-EL 2 TOL=0.1 [0 10][0.0]							!coupling of a point: design element 2D - design element 1D
  DE-BREP-EL   10  1   5    DE-EL  1 DE-EL 2 TOL=0.1 [0.0][0.0]								!coupling of a point: design element 1D - design element 1D
  DE-BREP-EL   11  1   5    DE-BREP  1 DE-EL 2 TOL=0.1 [0.0][0 10]							!coupling of a point: designboundary ( = brep edge) - design element 2D
  DE-BREP-EL   12  1   5    DE-BREP  1 DE-EL 2 TOL=0.1 [0.0][0.0]							!coupling of a point: designboundary ( = brep edge) - design element 1D
  DE-BREP-EL   13  1   5    DE-BREP  1 DE-BREP 2 TOL=0.1 [0.0][0.0]							!coupling of a point: designboundary ( = brep edge) - designboundary ( = brep edge)

Boundary Conditions

Design BRep elements can be used for applying Dirichlet and Neumann boundary conditions. The type of the Dirichlet boundary condition is defined in the property and the support block. Respective properties are BRep Edge Coupling and BRep Point with corresponding BREP_TYPE.

Example of a Complete Input Block

!===================================================================
!             ID  PART  PROP   NURBS_TOP
DE-BREP-NURBS
  DE-BREP-EL   1   1   4    PATCH_PAR  1  OF   DE-EL  2						!brep edge for supports, load, etc.
  !DE-BREP-EL  2   1   5    [0.0] OF PATCH_PAR  1  OF   DE-EL  2			        !point on brep edge for supports, load, etc.
  DE-BREP-EL   3   1   5    [0.0] OF DE-BREP  1							!point on design boundary ( = brep edge) for supports, load, etc.
  DE-BREP-EL   4   1   5    [0 10] OF DE-EL  2							!point on design element 2D for supports, load, etc.
  !DE-BREP-EL  5   1   5    [0.0] OF DE-EL  1							!point on design element 1D for supports, load, etc.

They have to be activated in the support block, but not added to the LD-COM block.

DE-SUP   1   1       DE-BREP1     DISP_X, DISP_Y, DISP_Z
DE-SUP   2   1       DE-BREP1     DISP_T1, DISP_T2, DISP_T3

Structural Elements

The implicit, geometric description within another geometric entity can be also used for strucutral elements. By now, these are BRep Edge Beam and BRep Edge Cord.

Example of a Complete Input Block

!===================================================================
!             ID  PART  PROP   NURBS_TOP
DE-BREP-NURBS
  !geometric definitions
  DE-BREP-EL   1   1   6    PATCH_PAR  1  OF   DE-EL  1						!brep edge for supports, load, etc.
  DE-BREP-EL   11  1   6    [0.0 10.0] OF PATCH_PAR  4  OF   DE-EL  1                           !interval on a brep edge for supports, load, etc.

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