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Zbl 1190.34029
Rachuunková, Irena; Tomeček, Jan
Bubble-type solutions of nonlinear singular problems. (English)
[J] Math. Comput. Modelling 51, No. 5-6, 658-669 (2010). ISSN 0895-7177

Summary: The paper describes the set of all solutions of the singular initial problems $$(p(t)u')'=p(t)f(u),~u(0)=B,~u'(0)=0$$ on the half-line $[0,\infty)$. Here $B<0$ is a parameter, $p(0)=0$ and $p'>0$ on $(0,\infty),$ $f(L)=0$ for some $L>0$ and $xf(x)<0$ if $x<L$, $x\neq 0$. By means of this result, the existence of a strictly increasing solution of this problem satisfying $u(\infty)=L$ is proved under some additional assumptions. In particular cases,this homoclinic solution determines an increasing mass density in centrally symmetric gas bubbles which are surrounded by an external liquid with density $L$.

MSC 2000:: *34B40 Boundary value problems on infinite intervals
34B16 Singular nonlinear boundary value problems
76N10 Compressible fluids, general

Keywords: singular ordinary differential equation of the second order; homoclinic solution; time singularities; unbounded domain

Cited in: Zbl 1203.34058

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