DVGRID

Bulk Data Entry Defines the relationship between a design variable and a grid point location.

Format

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
DVGRID DVID GID CID COEFF X Y Z    

Example

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
DVGRID 1 1032 0 1.0 1.0 0.0 0.0    

Definitions

Field Contents SI Unit Example
DVID DESVAR identification number.

(Integer > 0)

  
GID GRID identification number.

(Integer > 0)

  
CID Coordinate system identification number. A CID of zero or blank references the basic coordinate system.

Default = 0 (Integer ≥ 0)

  
COEFF Multiplier to the vector defined in fields 6, 7, and 8.  
X, Y, Z Components of the vector defining the perturbation of the grid in the coordinate system defined by CID.  

Comments

  1. Multiple references to the same grid ID will yield a summation of perturbation vectors for the given grid.
  2. The DVGRID data defines perturbations in the locations of the grids. The updated location of the grid is:(1)
    location new = location GRID + ∑ j   coef j [ x y z ] j [ N ] T xDV j
    Where, DV j is the value of design variable j and [ N ] T is the coordinate transformation matrix based on the CID and the GRID location.
  3. The OUTPUT, DVGRID option creates shape variable definitions for displacement or eigenvector results of linear static, normal modes, or linear buckling analyses. These shape variable definitions can then be used in subsequent optimizations. This process facilitates the use of "natural" shape functions.
  4. This card is represented as an optimization design variable in HyperMesh.