This simple example uses the classic Couette flow application to introduce the rotational periodic boundary condition feature. Both the velocity and the pressure are constrained between the two opposing faces. Non matching meshes are possible.
Fluid velocity fringes
*KEYWORD *TITLE *DATABASE_BINARY_D3PLOT *DEFINE_CURVE_TITLE *ICFD_BOUNDARY_PERIODIC *ICFD_BOUNDARY_PRESCRIBED_VEL *ICFD_BOUNDARY_FREESLIP *ICFD_CONTROL_TIME *ICFD_CONTROL_OUTPUT *ICFD_DEFINE_POINT *ICFD_MAT *ICFD_PART *ICFD_PART_VOL *ICFD_SECTION *INCLUDE *MESH_SURFACE_ELEMENT *MESH_SURFACE_NODE *MESH_VOLUME *PARAMETER *END
$----------------------------------------------------------------------------- $ $ Example provided by Iñaki (LSTC) $ $ E-Mail: info@dynamore.de $ Web: http://www.dynamore.de $ $ Copyright, 2015 DYNAmore GmbH $ Copying for non-commercial usage allowed if $ copy bears this notice completely. $ $X------------------------------------------------------------------------------ $X $X 1. Run file as is. $X Requires LS-DYNA MPP Dev 130100 (or higher) with double precision $X $X------------------------------------------------------------------------------ $# UNITS: Dimensionless. $X------------------------------------------------------------------------------ $X *KEYWORD *TITLE ICFD Couette flow *INCLUDE mesh3.k $mesh2.k $mesh1.k $---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8 $ $ $ PARAMETERS $ $ $ $---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8 *PARAMETER R T_end 30. R dt_plot 0.2 $ $--- Fluid $ R w_1 1.0 R w_2 -2.0 R angle 120. Rrho_fluid 1.00 R mu_fluid 0.02 R dt_fluid 0.02 $---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8 $ $ $ ICFD CONTROL CARDS $ $ $ $---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8 *ICFD_CONTROL_TIME $# ttm dt &T_end &dt_fluid *ICFD_CONTROL_OUTPUT 3 $---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8 $ $ $ ICFD PARTS/ SECTION/ MATERIAL $ $ $ $---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8 *ICFD_SECTION $# sid 1 *ICFD_MAT $# mid flg ro vis 1 1&rho_fluid &mu_fluid *ICFD_PART $# pid secid mid 1 1 1 *ICFD_PART $# pid secid mid 2 1 1 *ICFD_PART $# pid secid mid 3 1 1 *ICFD_PART $# pid secid mid 4 1 1 *ICFD_PART $# pid secid mid 5 1 1 *ICFD_PART_VOL $# pid secid mid 10 1 1 $# spid1 spid2 spid3 spid4 spid5 1 2 3 4 5 $---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8 $ $ $ ICFD BOUNDARY/INITIAL CONDITIONS $ $ $ $---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8 *ICFD_BOUNDARY_PRESCRIBED_VEL $# pid dof vad lcid 1 3 2 13 1 1 *ICFD_DEFINE_POINT 1 0 0 0 *ICFD_BOUNDARY_PRESCRIBED_VEL $# pid dof vad lcid 2 3 2 14 1 1 *ICFD_BOUNDARY_PERIODIC $# pidmast pertype pidslav axe ptid angle 4 1 3 3 1 &angle *ICFD_BOUNDARY_FREESLIP 5 *DEFINE_CURVE 13 0,&w_1 1000,&w_1 *DEFINE_CURVE 14 0,&w_2 100,&w_2 $---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8 $ $ $ ICFD MESH KEYWORDS $ $ $ $---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8 *MESH_VOLUME 10 1,2,3,4,5 $---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8 $ $ $ DATABASE (OUTPUT) $ $ $ $---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8 *DATABASE_BINARY_D3PLOT &dt_plot *END
