Partitioned Strong Coupling of Discrete Elements with Large Deformation Structural Finite Elements to Model Impact on Highly Flexible Tension Structures

Algorithm 2

Strong coupling: relaxed displacement and velocity.

(1)	Initialize
(2)	While time < end_time do
(3)	While interface _ res ≥ tolerance _ interface do
(4)	Search nearest neighbours and find contact ⟶ equations (13)–(15)
(5)	Calculate contact forces ⟶ equation (A.5)
(6)	Time integration of DEM part ⟶ equation (16)
(7)	Map forces on from to
(8)	Solve structure (FEM)
(9)	Map velocity and displacement on from to
(10)	Calculate residuals for velocity and displacement ⟶ equations (28) and (29)
(11)	Relax velocity and displacement ⟶ equations (31) and (32)
(12)	Update position of ⟶ equation (1)
(13)	interface_res = max(displacement_residual, velocity_residual)
(14)	Update position of  ⟶ equation (1)
(15)	Finalize