Simplest way to simulate 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?


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