cs_user_fluid_structure_interaction.f90 File Reference

User subroutines dedicated to Fluid-Structure interaction modeling. More...

Functions/Subroutines
subroutine	usstr1 (idfstr, aexxst, bexxst, cfopre, xstr0, vstr0, xstreq)
	Definition of internal structures and corresponding initial conditions (initial displacement and velocity ). More...
subroutine	usstr2 (nbstru, idfstr, dtcel, xmstru, xcstru, xkstru, xstreq, xstr, vstr, forstr, dtstr)
	Definition of structural parameters in case of Fluid Structure internal coupling : Mass, Friction, Stiffness anf Fluid Stresses. More...
subroutine	usaste (idfstr)
	User subroutine dedicated the Fluid-Structure external coupling with Code_Aster : Here one defines the boundary faces coupled with Code_Aster and the fluid forces components which are given to structural calculations. More...

Detailed Description

User subroutines dedicated to Fluid-Structure interaction modeling.

Management of internal Fluid-Structure coupled calculations:

a simplified solid model is used (linear "mass, friction and spring" modeling). Here are 2 differents subroutines that need to be filled :

• usstr1 : Called at the beginning of the calculation. It enables one to define internal structures and corresponding initial conditions (initial displacement and velocity).
• usstr2 : Called at each time step of the calculation. Here one structural parameters (considered to be potentially time dependent), i.e. Mass, Friction, Stiffness and Fluid Stresses.

Fluid-Structure coupling with Code_Aster:

the user subroutine usaste has to be used.

Examples of data settings for fluid-structure interaction (FSI):

Several examples are available here.

Function/Subroutine Documentation

usaste()

subroutine usaste

(

integer, dimension(nfabor)

idfstr

)

User subroutine dedicated the Fluid-Structure external coupling with Code_Aster : Here one defines the boundary faces coupled with Code_Aster and the fluid forces components which are given to structural calculations.

Parameters

[in]

idfstr

boundary faces -> structure definition

usstr1()

subroutine usstr1	(	integer, dimension(nfabor)	idfstr,
		double precision	aexxst,
		double precision	bexxst,
		double precision	cfopre,
		double precision, dimension(3,nstrmx)	xstr0,
		double precision, dimension(3,nstrmx)	vstr0,
		double precision, dimension(3,nstrmx)	xstreq
	)

Definition of internal structures and corresponding initial conditions (initial displacement and velocity ).

Parameters

[in]	idfstr	boundary faces -> structure definition
[in]	aexxst,bexxst	prediction coefficients of structural data
[in]	cfopre	prediction coefficients of fluid forces
[in]	xstr0	initial displacement of internal structures
[in]	vstr0	initial velocity of internal structures
[in]	xstreq	displacement of initial mesh compared to structures position at equilibrium

usstr2()

subroutine usstr2	(	integer	nbstru,
		integer, dimension(nfabor)	idfstr,
		double precision, dimension(ncelet)	dtcel,
		double precision, dimension(3,3,nstrmx)	xmstru,
		double precision, dimension(3,3,nstrmx)	xcstru,
		double precision, dimension(3,3,nstrmx)	xkstru,
		double precision, dimension(3,nstrmx)	xstreq,
		double precision, dimension(3,nstrmx)	xstr,
		double precision, dimension(3,nstrmx)	vstr,
		double precision, dimension(3,nstrmx)	forstr,
		double precision, dimension(nstrmx)	dtstr
	)

Definition of structural parameters in case of Fluid Structure internal coupling : Mass, Friction, Stiffness anf Fluid Stresses.

Parameters

[in]	nbstru	nombre de structures definies
[in]	idfstr	definition des structures
[in]	dtcel	time step (per cell
[in]	xmstru	matrix of structural mass
[out]	xcstru	matrix of structural friction
[out]	xkstru	matrix of structural stiffness
[in]	xstreq	displacement of initial mesh compared to
[in]	xstr	structural displacement
[in]	vstr	structural velocity
[in]	forstr	forces acting on structures (take forces)
[out]	dtstr	structural time step