Data for simulating interfacial instability and bubble pinch-off in a soft capillary tube

<p><strong>Overview:</strong> This dataset includes simulation data for the displacement of glycerol by air in a soft capillary tube. This is a fluid-structure interaction (FSI) problem involving two immiscible fluids. Our computational model employs a phase-field model for the fluids’ governing equations and a nonlinear hyperelastic model for the solid. Our focus is on micro-scale problems, where the interplay between capillary forces, viscous forces and elastic forces determines the onset of interfacial instability and bubble pinch-off in the tube.</p>

<p><strong>Context and Objectiv</strong>e: The primary objective of this dataset is to elucidate the effects of three parameters: inlet capillary number, elastocapillary number (related to the tube’s deformability), and tube’s wettability on the onset of instability in the capillary tube. Our simulations can help us better understand the dynamic interactions between fluids and deformable solids in many applications, such as soft porous media, bio-microfluidics, and pressure-actuated soft robotics.</p>

<p><strong>Data Collection: </strong>The data in this repository were collected from axisymmetric numerical simulations of a multi-component FSI model. Detailed information about our model and numerical formulation can be found in [1, 2]. </p>

<p><strong>References</strong></p>

<p>1. S. R. Bhopalam, R. Juanes and H. Gomez, Simulating fluid-fluid displacement in a soft capillary tube: How compliance delays interfacial instability and bubble pinch-off, arXiv, 2025.</p>

<p>2. S. R. Bhopalam, R. Juanes and H. Gomez, Simulating fluid-fluid displacement in a soft capillary tube: How compliance delays interfacial instability and bubble pinch-off, <em>Computer Methods in Applied Mechanics and Engineering</em>, 2026.</p>

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