One of’ t.be most. f’undament.al problems of’ f’luid dynamicswhich at.t.r·act.ed t.he at .. tent.ion of’ many researchers is t.hest.udy of’ t.wo-dimensional now past. a f’Lat, plat.e. When t.hep Lat.e is set. parallel t.o a uruf’or-m How; some analyt.icalapproaches based on Navier-St.okes equat.ions are possible,but. when it. is set. at. non-zero an€;le relat.ive t.o t.he mainsrt.r-e arn,becausebecomesit.of’becomesimpossiblet.o €;et. analyt,ical solut.iont.he equat.ions. The problemplat.e is set. near a planet.he wake charact.erist.ics,t.henon-lineari t. Y of’dif’f’icult.when t.hemoreboundary. The boundary &It.erschan€;e t.he vor-t-ex sheddingplat.e/wake int.eract.ion.In t.he present. t.hesis, a case of’ an impulsively-st.ar·t.ednow about. an inclined f’lat. plat.e rie ar- a plane boundary issimulat.ed by an inviscid model, which is called ”discret.efr-e que noyandaf’f’ect.st.hevor-t.ex model”, combined wrt.h t.he surf’ace siO€;ular·it.y met.hodCvor-t.ox-Lat, t.ice met.hod) in which t.he plat.e is replaced by adist.ribut.ion of’ point. vor-t.rce s called boundary vort.ices. Thef r-e-e sheal.~ layers which emanat.e f’r-orn t.he sides of’ t.he plat.e