2D balloon being inflated with liquid, inside pipe

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Hello!

I'm very new to COMSOL so I can only ask this question in simple terms.

I have a 2D cross-section of a circular balloon thats filled with liquid, the balloon is inside a rigid pipe that's marginally larger in diameter than the balloon and has some irregularities across the surface, and the pipe itself is also filled with a liquid. What is the simplest/most lightweight method of simulating the balloon expanding from a uniform inflow of more liquid/uniform increase in pressure, until it is pressing against the pipe and deforming around the irregularities?

Eventually I'd also like to divide the balloon into four quadrants with interior walls of the same material. Could I apply the same method to that case too?


2 Replies Last Post 2026/04/22 9:09 GMT-4
Magnus Ringh COMSOL Employee

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Posted: 4 hours ago 2026/04/22 7:50 GMT-4

Hi,

This application example might help:

https://www.comsol.com/model/inflation-of-a-spherical-rubber-balloon-12599

Magnus Ringh, COMSOL

Hi, This application example might help: Magnus Ringh, COMSOL

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Posted: 3 hours ago 2026/04/22 9:09 GMT-4

Hi,

This application example might help:

Magnus Ringh, COMSOL

Thank you, Magnus! That example is exactly where I want to end up, eventually. However, I don't have the skills to work my way backwards from a "complete" simulation to a simplistic/skeletal one, which is all I dare to attempt right now. Do you have any recommendations on how to break down your example to the bare necessities of simulating the case?

/Felix

>Hi, > >This application example might help: > > > >Magnus Ringh, COMSOL Thank you, Magnus! That example is exactly where I want to end up, eventually. However, I don't have the skills to work my way backwards from a "complete" simulation to a simplistic/skeletal one, which is all I dare to attempt right now. Do you have any recommendations on how to break down your example to the bare necessities of simulating the case? /Felix

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