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PONAŠANJE BRODA NA TALASIMA____________________________Urselovim rešenjem određuju sehidrodinamički koeficijenti kružnihrebara...Ali, to je tek prvi korak...Drugi korak je konformno preslikavanjePoznato je, iz Mehanike fluida, da setransformacijom Žukovskog⎛ a1⎞Z = ao⎜z+z⎟⎝ ⎠strujanje oko kružnice preslikava ustrujanje oko aeroprofila...Koeficijenti a o , a 1 određuju oblikaeroprofila – tzv. profila Žukovskog, iugao nastrujavanja...Za brodogradnju je daleko značajnija tzv.Lujsova (Lewis) transformacija⎛ a aZ = a ⎜z+ +⎝zz1 3o 3sa kojom se strujanje oko kružnice preslikavau strujanje oko tzv. Lujsovog rebra...Koeficijenata a 1 , a 3 određuju oblik rebra...⎞⎟⎠PREDAVANJA 2009. 29
PONAŠANJE BRODA NA TALASIMA____________________________Ustvari, oblik rebra zavisi od dvabezdimenziona – brodska parametraB 21 ( + a1 + a3)=T ( 1− a + a )βR= =1 32 2( 1−a1 −3a3)A πBT 4 1+ a −a( )Lujsova rebra izgledaju2 23 1Lujsova rebra se ne poklapaju sa stvarnimbrodskim rebrima...Realna brodska rebra istog β , i istog B/Tmogu imati različit oblik...Ipak, Lujsova rebra odgovaraju tipičnimoblim rebrima, blagog uzvoja...Nisu dobra aproksimacija za glisere ibrodove oštrog uzvoja...Z l i lik β L j b i tiZa malo i veliko β , Lujsova rebra mogu imatineprihvatljiv oblikPREDAVANJA 2009. 30
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