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Isoparametric singularity extraction technique for 3D potential problems in BEMKanduč, Tadej, 1985-Robne integralske enačbe, ki se pojavijo v potencialni teoriji na gladkih ukrivljenih ploskvah v kolokacijski metodi robnih elementov, rešujemo z analitično ekstrakcijo singularnosti. Z uvedbo ... izoparametričnega pristopa so ukrivljene ploskve predstavljene kot preslikani pravokotniki ali trikotniki iz parametrične domene. Odstranitev singularnosti v singularnih integralih lahko izvedemo kot operacijo odštevanja ali deljenja, pri čemer ima vsak pristop določeno prednost. Obravnavamo poseben razvoj singularnega jedra v vrsto okoli izvorne točke. Vrsta je v parametričnih koordinatah sestavljena iz funkcij oblike ▫$R^p x^q y^r$▫, kjer je ▫$R$▫ kvadratni koren kvadratnega dvorazsežnega homogenega polinoma s koeficienti, ki ustrezajo prvi fundamentalni formi za gladke ploskve, ▫$p,q,r$▫ pa so cela števila, ki ustrezajo pogojem ▫$p \leq -1$▫, ▫$q,r \geq 0$▫. Z ekstrakcijo več členov iz omenjene vrste lahko povečamo gladkost regulariziranega jedra v izvorni točki. Analitične formule za integrale takšnih členov izpeljemo preko primitivnih funkcij členov ▫$R^p x^q y^r$▫, z uporabo rekurzivnih formul in nato z izračunom dobljenih funkcij na robovih pravokotnih ali trikotnih parametričnih domen. Z numeričnimi testi pokažemo, da je lahko tehnika odstranjevanja singularnosti uporaben začetni korak pri numerični integraciji, da dosežemo visok red konvergence natančnosti singularnih integralov, ki nastopajo v 3D kolokacijski metodi robnih elementov, tako glede na število kvadraturnih vozlov kot glede na velikost celic v računski mreži.Source: Computer methods in applied mechanics and engineering. - ISSN 0045-7825 (Vol. 398, art. no. 115271, Aug. 2022, 25 str.)Type of material - article, component part ; adult, seriousPublish date - 2022Language - englishCOBISS.SI-ID - 139374339

source: Computer methods in applied mechanics and engineering. - ISSN 0045-7825 (Vol. 398, art. no. 115271, Aug. 2022, 25 str.)



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Kanduč, Tadej, 1985- | 32770 |
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