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Fluid Structure Interactions

Flu­id struc­ture in­ter­ac­tion prob­lems oc­cur in physics when­ev­er the flow over a struc­ture caus­es de­for­ma­tion which in turn, may in­flu­ence the way the flu­id be­haves. In or­der to ac­cu­rate­ly rep­re­sent­ing these in­ter­ac­tions, the flu­id part and the struc­tur­al part evolve in a cou­pled sys­tem where flu­id forces ap­plied on the sol­id and sol­id dis­place­ments through the flu­id in­ter­act at each time step.

This opens a very wide range of analy­sis and ap­pli­ca­tions such as the fa­tigue of air­plane wings, air­foils or tur­bine blades for the aero­space and tur­bo ma­chin­ery in­dus­try, the study of gal­lop­ing, vi­bra­tions and flut­ter­ing of flaps, bridges or sim­i­lar struc­tures, the analy­sis of ar­ti­fi­cial heart valve open­ings or oth­er pros­the­sis for the bio-med­ical in­dus­try and so on.

One of the solver's main fea­tures is the im­ple­men­ta­tion of a ro­bust strong FSI cou­pling that be trig­gered through the use of LS-DY­NA's im­plic­it solver for the sol­id me­chan­ics part.

This test case fea­tures a FSI test case where strong cou­pling is need­ed in or­der to avoid the in­sta­bil­i­ties due to the so called ”added mass ef­fect” that oc­curs when the den­si­ty of the sol­id ap­proach­es the den­si­ty of the flu­id. This test case is of­ten re­ferred to as "The Turek test case" from the name of one of its co-au­thors (Read more).

The pur­pose of this FSI test case is to study the ver­ti­cal in­duced os­cil­la­tions of a rec­tan­gle un­der the in­flu­ence of a in­com­ing flow. This test case pro­vides the first step in or­der to study com­plex os­cil­la­to­ry phe­nom­e­na such as the flut­ter­ing of a bridge deck (Read more).
This test case is part of the SPHER­IC bench­mark li­brary and is a com­bi­na­tion of a free sur­face prob­lem with a FSI prob­lem and re­quires strong cou­pling ca­pa­bil­i­ties. It is there­fore a good can­di­date to high­light the ICFD solver's ca­pa­bil­i­ties (Read more)