%0 Generic %1 saha2025numerical %A Saha, Rishav %A Weigand, Bernhard %D 2025 %K %R 10.18419/darus-5363 %T Numerical Data for: Numerical simulation of droplet impact onto a smooth heated substrate %X In this work, we studied FC-72 (refrigerant perfluorohexane) droplet impact onto a hot calcium fluoride (CaF2) substrate to observe both solid cooling and droplet spreading, thereby gaining insight into the heat transfer mechanism during thespreading process. The surface is super-hydrophobic, which corresponds to a contact angle of 180°. 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. An FC-72 droplet of size 1.02 mm impacts with an impact velocity of 0.26 m/s onto a super-hydrophobic calcium fluoride surface. The solid substrate is maintained at 342K, which is 13K higher than the saturation temperature of the liquid (FC-72). Both the droplet and the ambient gas are at 293K. This corresponds to a Weber number of 14 and a Reynolds number of 955. The energy equation is solved using a single temperature field and phase change is ignored. As the surface is flat, no cell contains all three phases (solid, liquid and gas). The computational domain consists of (128*128*256) cells, which corresponds to 60 cells per initial droplet diameter. Images are available in a separate directory, for different time instances, stored as time_ms.png. Two simulation videos are stored for the temperature distribution, one for the dimensionless temperature (T) of the system and one with absolute temperature. The data is saved in HDF5 files. The simulation data for 20ms is stored in 50 timesteps. For each timestep, the VOF variable (funs00*.hdf), solid volume (fun300*.hdf), pressure (pres00*.hdf), temperature (temp00*.hdf) and velocity (velv00*.hdf) are stored. VOF is a scalar field with values between 0 and 1, indicating the phases between ambient gas (air) as 0, and drop liquid (FC-72) 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 FC-72 (refrigerant perfluorohexane) droplet impact onto a hot calcium fluoride (CaF2) substrate to observe both solid cooling and droplet spreading, thereby gaining insight into the heat transfer mechanism during thespreading process. The surface is super-hydrophobic, which corresponds to a contact angle of 180°. 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. An FC-72 droplet of size 1.02 mm impacts with an impact velocity of 0.26 m/s onto a super-hydrophobic calcium fluoride surface. The solid substrate is maintained at 342K, which is 13K higher than the saturation temperature of the liquid (FC-72). Both the droplet and the ambient gas are at 293K. This corresponds to a Weber number of 14 and a Reynolds number of 955. The energy equation is solved using a single temperature field and phase change is ignored. As the surface is flat, no cell contains all three phases (solid, liquid and gas). The computational domain consists of (128*128*256) cells, which corresponds to 60 cells per initial droplet diameter. Images are available in a separate directory, for different time instances, stored as time_ms.png. Two simulation videos are stored for the temperature distribution, one for the dimensionless temperature (T) of the system and one with absolute temperature. The data is saved in HDF5 files. The simulation data for 20ms is stored in 50 timesteps. For each timestep, the VOF variable (funs00*.hdf), solid volume (fun300*.hdf), pressure (pres00*.hdf), temperature (temp00*.hdf) and velocity (velv00*.hdf) are stored. VOF is a scalar field with values between 0 and 1, indicating the phases between ambient gas (air) as 0, and drop liquid (FC-72) 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, Weigand, Bernhard/University of Stuttgart}, author = {Saha, Rishav and Weigand, Bernhard}, biburl = {https://puma.ub.uni-stuttgart.de/bibtex/2f494b5c492f6e06df7390511c9833218/unibiblio}, doi = {10.18419/darus-5363}, howpublished = {Dataset}, interhash = {45e110aa6b7cf8b328b45f661cb37cef}, intrahash = {f494b5c492f6e06df7390511c9833218}, keywords = {}, orcid-numbers = {Saha, Rishav/https://orcid.org/0009-0006-5847-2627, Weigand, Bernhard/https://orcid.org/0000-0002-1469-079X}, timestamp = {2025-12-08T13:46:37.000+0100}, title = {Numerical Data for: Numerical simulation of droplet impact onto a smooth heated substrate}, year = 2025 }