%0 Generic %1 saha2025numerical %A Saha, Rishav %A Inal, Cemre %A Kumar, Manish %A Weigand, Bernhard %D 2025 %K %R 10.18419/darus-5365 %T Numerical Data for: DNS of water droplet impact onto smooth surfaces at various static contact angles %X In this work, we studied the droplet spreading process and its dependence on the Weber number. We also investigated the influence of the static contact angle on the maximum spreading. This study employs a Computational Fluid Dynamics (CFD) framework to simulate the impact dynamics using the Finite Volume method. The interface is defined by the Volume of Fluid (VOF) method and the Piecewise Linear Interface Calculation (PLIC) method. The Direct Numerical Simulation (DNS) tool Free Surface 3D (FS3D), an in-house code at the Institute of Aerospace Thermodynamics, University of Stuttgart, is utilized. 3D simulations are performed for a quarter of the droplet. Six water droplet impact cases are simulated with Weber numbers of 20, 40, 60, 80, 100, and 120. The initial droplet diameter is set to 1 mm, and the corresponding impact velocities are 1.21, 1.71, 2.09, 2.41, 2.70, 2.95 m/s. Each case is studied using static contact angles (CA_st) of 0°, 90°, and 180°. Static contact angles of 0° and 180° were implemented using a solid surface embedded in the computational domain using the cut-cell method introduced in FS3D (see M. Baggio and B. Weigand, “Numerical simulation of a drop impact on a superhydrophobic surface with a wire,” Physics of Fluids 31.11 (2019), 112107). For the case with a static contact angle of 90°, a wall boundary condition is applied at the bottom face of the 3D domain. In the DNS result at the highest Weber number investigated (We = 120) with a superhydrophobic surface (CA_st =180°), the formation of secondary droplets and film breakage was observed. Therefore, no simulation data is provided.All data for the cases with a static contact angle (CA_st) of 0°, 90° and 180° are provided till 3 ms. Any droplet breakup observed during or after the maximum spreading stage should be considered non-physical. The main goal of this work is to calculate the maximum spreading diameter. The computational domain consists of (512*512*256) cells, which corresponds to 200 cells per initial droplet diameter. The data for all cases are provided in HDF5 format, with filenames as “WeberNumber_StaticContactAngle”. For each timestep, the VOF variable is stored only for the X-Z plane as the spreading is axisymmetric (cropped to 512*1*256 cells). VOF is a scalar field with values between 0 and 1, indicating the phases between ambient gas (air) as 0, and drop liquid (water) as 1, and the interface in between. The results are provided starting from the moment of droplet impact onto the surface. The simulation was performed as part of the GRK 2160 within the subproject SP-B5.

@misc{saha2025numerical, abstract = {In this work, we studied the droplet spreading process and its dependence on the Weber number. We also investigated the influence of the static contact angle on the maximum spreading. This study employs a Computational Fluid Dynamics (CFD) framework to simulate the impact dynamics using the Finite Volume method. The interface is defined by the Volume of Fluid (VOF) method and the Piecewise Linear Interface Calculation (PLIC) method. The Direct Numerical Simulation (DNS) tool Free Surface 3D (FS3D), an in-house code at the Institute of Aerospace Thermodynamics, University of Stuttgart, is utilized. 3D simulations are performed for a quarter of the droplet. Six water droplet impact cases are simulated with Weber numbers of 20, 40, 60, 80, 100, and 120. The initial droplet diameter is set to 1 mm, and the corresponding impact velocities are 1.21, 1.71, 2.09, 2.41, 2.70, 2.95 m/s. Each case is studied using static contact angles (CA_st) of 0°, 90°, and 180°. Static contact angles of 0° and 180° were implemented using a solid surface embedded in the computational domain using the cut-cell method introduced in FS3D (see M. Baggio and B. Weigand, “Numerical simulation of a drop impact on a superhydrophobic surface with a wire,” Physics of Fluids 31.11 (2019), 112107). For the case with a static contact angle of 90°, a wall boundary condition is applied at the bottom face of the 3D domain. In the DNS result at the highest Weber number investigated (We = 120) with a superhydrophobic surface (CA_st =180°), the formation of secondary droplets and film breakage was observed. Therefore, no simulation data is provided.All data for the cases with a static contact angle (CA_st) of 0°, 90° and 180° are provided till 3 ms. Any droplet breakup observed during or after the maximum spreading stage should be considered non-physical. The main goal of this work is to calculate the maximum spreading diameter. The computational domain consists of (512*512*256) cells, which corresponds to 200 cells per initial droplet diameter. The data for all cases are provided in HDF5 format, with filenames as “WeberNumber_StaticContactAngle”. For each timestep, the VOF variable is stored only for the X-Z plane as the spreading is axisymmetric (cropped to 512*1*256 cells). VOF is a scalar field with values between 0 and 1, indicating the phases between ambient gas (air) as 0, and drop liquid (water) as 1, and the interface in between. The results are provided starting from the moment of droplet impact onto the surface. The simulation was performed as part of the GRK 2160 within the subproject SP-B5. }, added-at = {2025-12-08T14:46:23.000+0100}, affiliation = {Saha, Rishav/University of Stuttgart, Inal, Cemre/University of Stuttgart, Kumar, Manish/University of Stuttgart, Weigand, Bernhard/University of Stuttgart}, author = {Saha, Rishav and Inal, Cemre and Kumar, Manish and Weigand, Bernhard}, biburl = {https://puma.ub.uni-stuttgart.de/bibtex/2ba8b50343b1ec0fd926d58cae03ea6d2/unibiblio}, doi = {10.18419/darus-5365}, howpublished = {Dataset}, interhash = {0cc41c7dc6f59ef4045bb35a4e8ea2ef}, intrahash = {ba8b50343b1ec0fd926d58cae03ea6d2}, keywords = {}, note = {Related to: "DNS of droplet impact onto smooth and micro-structured surfaces", submitted at the ILASS Europe 2025 conference. (Not yet online)}, orcid-numbers = {Saha, Rishav/https://orcid.org/0009-0006-5847-2627, Inal, Cemre/https://orcid.org/0009-0002-1527-3055, Kumar, Manish/https://orcid.org/0000-0002-0638-9040, Weigand, Bernhard/https://orcid.org/0000-0002-1469-079X}, timestamp = {2025-12-08T13:46:37.000+0100}, title = {Numerical Data for: DNS of water droplet impact onto smooth surfaces at various static contact angles}, year = 2025 }