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Numerical Simulation for Drop Impact on Textured Surfaces

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Droplet Interactions and Spray Processes

Part of the book series: Fluid Mechanics and Its Applications ((FMIA,volume 121))

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Abstract

Superhydrophobic surfaces with small-scale features have recently gained interest, because impacting droplets may bounce-off faster with respect to a flat superhydrophobic surface. For such surfaces the correct numerical prediction of the impact phenomena is very difficult. Our goal is the numerical study of drop impact on such surfaces using Free Surface 3D (FS3D), our in-house code for the simulation of incompressible multi-phase flows. Until recently, FS3D was not able to represent the interaction of a droplet with a complex textured solid surface. In this work, we show how we added this feature to the code by implementing the representation of embedded arbitrary-shaped boundaries using a Cartesian grid. Two approaches were developed; a preliminary simplified approach and an ultimate, more rigorous one. We discuss both implementations and we show a comparison of the two approaches for a test case. The results show that the predictions for impact dynamics of the two approaches slightly differ. Although, the simplified approach shows only small errors in mass conservation, it is fundamentally not conservative. With the introduction of a new approach we were able to improve the conservativeness of our simulations.

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Acknowledgements

We thank the German Science Foundation (DFG) for the financial support of this research within the international research training group Droplet Interaction Technologies, DROPIT, GRK 2016/1.

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Authors and Affiliations

  1. Institute of Aerospace Thermodynamics, University of Stuttgart, Pfaffenwaldring 31, 70569, Stuttgart, DE, Germany

    Martina Baggio & Bernhard Weigand

Authors
  1. Martina Baggio
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  2. Bernhard Weigand
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Corresponding author

Correspondence to Martina Baggio .

Editor information

Editors and Affiliations

  1. Institute of Aerospace Thermodynamics, University of Stuttgart, Stuttgart, Baden-Württemberg, Germany

    Grazia Lamanna

  2. Dipartimento di Ingegneria e Scienze Applicate, Università degli Studi di Bergamo, Dalmine, Bergamo, Italy

    Simona Tonini

  3. Dipartimento di Ingegneria e Scienze Applicate, Università degli Studi di Bergamo, Dalmine, Bergamo, Italy

    Gianpietro Elvio Cossali

  4. Institute of Aerospace Thermodynamics, University of Stuttgart, Stuttgart, Baden-Württemberg, Germany

    Bernhard Weigand

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Baggio, M., Weigand, B. (2020). Numerical Simulation for Drop Impact on Textured Surfaces. In: Lamanna, G., Tonini, S., Cossali, G., Weigand, B. (eds) Droplet Interactions and Spray Processes. Fluid Mechanics and Its Applications, vol 121. Springer, Cham. https://doi.org/10.1007/978-3-030-33338-6_10

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  • DOI: https://doi.org/10.1007/978-3-030-33338-6_10

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-030-33337-9

  • Online ISBN: 978-3-030-33338-6

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