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The workpiece is melted by a high-powered laser beam and the resulting melt is blown away by a jet of gas. The laser assist gas is crucial as it influences the cutting speed, edge quality, and thermal effects, ultimately affecting the overall efficiency and accuracy of the process. However, modeling the laser assist gas is highly challenging due to the immense computational costs associated when dealing with shock waves, turbulence, and high speed jet dynamics. An approach is presented to model the formation of the cutting front and the dynamics of the melt film, influenced by the cutting assist gas forces acting upon it, using the Smoothed Particle Hydrodynamics (SPH) method. SPH is able to deal with large material displacements and moving boundaries occurring in the laser cutting process. The forces applied to the melt film and cutting kerf are modeled using the Continuum Surface Force approach and boundary particle detection. Consequently, the effects of the assist gas are calculated without modelling the assist gas phase domain, saving a significant amount of computational cost and reducing the complexity of the model. The SPH model is coupled with a ray-tracing scheme and a Fresnel absorption model to determine the laser-material interaction. The presented approach is compared against experimental data from literature, showing good agreement with the experimentally observed cutting front formation, melt ejection, phase transition, dross formation, and striation patterns. The results show that SPH can be effectively applied in applications related to laser cutting, showing its potential to design precise and accurate numerical models. Moreover, the proposed parameterized model can help to optimize process parameters to maximize material utilization and reduce energy consumption, operational cost, and processing time during laser cutting.", "issn" : "2196-7237", "doi" : "10.1007/s40516-025-00318-4", "bibtexKey": "Anjana2025" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/26987382b9634f9848d1c39d4b98d16de/andreasbaumann", "tags" : [ "dem","ejector_drill","myown","sph" ], "intraHash" : "6987382b9634f9848d1c39d4b98d16de", "interHash" : "614d001376bbd9545b48407fa6e7ff67", "label" : "Numerical and Experimental Evaluation of Chip Evacuation and Lubricant Flow using Optimized Drill Heads for Ejector Deep Hole Drilling", "user" : "andreasbaumann", "description" : "", "date" : "2025-10-07 14:14:26", "changeDate" : "2025-10-07 14:14:26", "count" : 2, "pub-type": "preprint", "journal": "Production Engineering", "year": "2025", "url": "https://arxiv.org/abs/2508.02333", "author": [ "Nuwan Rupasinghe","Sebastian Michel","Andreas Baumann","Julian Gerken","Samuel Gülde","Dirk Biermann","Peter Eberhard" ], "authors": [ {"first" : "Nuwan", "last" : "Rupasinghe"}, {"first" : "Sebastian", "last" : "Michel"}, {"first" : "Andreas", "last" : "Baumann"}, {"first" : "Julian", "last" : "Gerken"}, {"first" : "Samuel", "last" : "Gülde"}, {"first" : "Dirk", "last" : "Biermann"}, {"first" : "Peter", "last" : "Eberhard"} ], "eprint" : "2508.02333", "archiveprefix" : "arXiv", "primaryclass" : "physics.flu-dyn", "bibtexKey": "rupasinghe2025" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/210c583d6f6ab452e6360349db84fea94/andreasbaumann", "tags" : [ "dhd","myown","sph" ], "intraHash" : "10c583d6f6ab452e6360349db84fea94", "interHash" : "3b8df9081aa01f39f73518e8736afa3f", "label" : "Investigation of chip jamming and drill breakage in deep-hole drilling using Smoothed Particle Hydrodynamics", "user" : "andreasbaumann", "description" : "", "date" : "2025-04-25 10:34:43", "changeDate" : "2025-04-25 16:44:14", "count" : 1, "pub-type": "inproceedings", "booktitle": "Proceedings of the 18th CIRP Conference on Intelligent Computation in Manufacturing Engineering", "year": "2024", "url": "https://elib.uni-stuttgart.de/handle/11682/16057", "author": [ "Andreas Baumann","Peter Eberhard" ], "authors": [ {"first" : "Andreas", "last" : "Baumann"}, {"first" : "Peter", "last" : "Eberhard"} ], "venue" : "Ischia, Italy", "copyright" : "CC-BY-NC-ND", "language" : "en", "eventdate" : "July 2024", "doi" : "10.18419/OPUS-16038", "bibtexKey": "Baumann24b" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2466bed085d22dc7428355c22b78f20df/andreasbaumann", "tags" : [ "dem","myown","sph" ], "intraHash" : "466bed085d22dc7428355c22b78f20df", "interHash" : "be3d9607c220ab8e2fcb3fd381e690b1", "label" : "Investigation of Chip Evacuation in Ejector Deep Hole Drilling using Mesh-Free Simulation Methods", "user" : "andreasbaumann", "description" : "", "date" : "2025-03-21 07:49:12", "changeDate" : "2025-04-25 11:01:45", "count" : 1, "pub-type": "inproceedings", "booktitle": "Proceedings of the 18th CIRP Conference on Intelligent Computation in Manufacturing Engineering", "year": "2024", "url": "https://arxiv.org/abs/2503.15982", "author": [ "Nuwan Rupasinghe","Julian Frederic Gerken","Andreas Baumann","Peter Eberhard","Dirk Biermann" ], "authors": [ {"first" : "Nuwan", "last" : "Rupasinghe"}, {"first" : "Julian Frederic", "last" : "Gerken"}, {"first" : "Andreas", "last" : "Baumann"}, {"first" : "Peter", "last" : "Eberhard"}, {"first" : "Dirk", "last" : "Biermann"} ], "venue" : "Ischia, Italy", "language" : "en", "eventdate" : "July 2024", "eprint" : "2503.15982", "archiveprefix" : "arXiv", "primaryclass" : "physics.flu-dyn", "doi" : "10.48550/arXiv.2503.15982", "bibtexKey": "rupasinghe2024" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2485e07d9c9de29234049db7f99c48e19/andreasbaumann", "tags" : [ "LLM","RAG","myown" ], "intraHash" : "485e07d9c9de29234049db7f99c48e19", "interHash" : "a1f690f220db773c8b9f09d4fd9108a1", "label" : "Experiments with Large Language Models on Retrieval-Augmented Generation for Closed-Source Simulation Software", "user" : "andreasbaumann", "description" : "PrePrint", "date" : "2025-02-07 08:45:22", "changeDate" : "2025-02-07 08:47:03", "count" : 2, "pub-type": "misc", "year": "2025", "url": "https://arxiv.org/abs/2502.03916", "author": [ "Andreas Baumann","Peter Eberhard" ], "authors": [ {"first" : "Andreas", "last" : "Baumann"}, {"first" : "Peter", "last" : "Eberhard"} ], "eprint" : "2502.03916", "archiveprefix" : "arXiv", "primaryclass" : "cs.CL", "doi" : "10.48550/arXiv.2502.03916", "bibtexKey": "baumann2025a" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/239490ab39a0d2ed2010fece0e93675cc/andreasbaumann", "tags" : [ "art","fem","myown","transport" ], "intraHash" : "39490ab39a0d2ed2010fece0e93675cc", "interHash" : "9cfba0fe95fa574a62a5dbb15fdfd6fe", "label" : "On a newly developed transport method for sensitive cradled panel paintings", "user" : "andreasbaumann", "description" : "", "date" : "2024-11-12 09:52:42", "changeDate" : "2024-11-12 09:52:42", "count" : 2, "pub-type": "article", "journal": "Journal of Cultural Heritage","publisher":"Elsevier BV", "year": "2024", "url": "http://dx.doi.org/10.1016/j.culher.2024.10.015", "author": [ "Eva Hartlieb","Pascal Ziegler","Andreas Baumann","Peter Schöler","Peter Eberhard","Stefan Velte","Manuela Wiesend","Daniela Karl" ], "authors": [ {"first" : "Eva", "last" : "Hartlieb"}, {"first" : "Pascal", "last" : "Ziegler"}, {"first" : "Andreas", "last" : "Baumann"}, {"first" : "Peter", "last" : "Schöler"}, {"first" : "Peter", "last" : "Eberhard"}, {"first" : "Stefan", "last" : "Velte"}, {"first" : "Manuela", "last" : "Wiesend"}, {"first" : "Daniela", "last" : "Karl"} ], "volume": "70","pages": "441\u2013449", "issn" : "1296-2074", "doi" : "10.1016/j.culher.2024.10.015", "bibtexKey": "Hartlieb_2024" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/290265a1a6e539f1c327cf759ec3b55a7/andreasbaumann", "tags" : [ "deep-hole-drilling","myown","sph" ], "intraHash" : "90265a1a6e539f1c327cf759ec3b55a7", "interHash" : "a50e8061173d32863f6e5914229741ad", "label" : "Modeling and mitigation of vortex formation in ejector deep hole drilling with smoothed particle hydrodynamics", "user" : "andreasbaumann", "description" : "", "date" : "2024-07-03 12:53:08", "changeDate" : "2024-12-19 09:58:49", "count" : 2, "pub-type": "article", "journal": "Computational Particle Mechanics", "year": "2024", "url": "https://doi.org/10.1007/s40571-024-00789-w", "author": [ "Andreas Baumann","Julian Frederic Gerken","Daniel Sollich","Nuwan Rupasinghe","Dirk Biermann","Peter Eberhard" ], "authors": [ {"first" : "Andreas", "last" : "Baumann"}, {"first" : "Julian Frederic", "last" : "Gerken"}, {"first" : "Daniel", "last" : "Sollich"}, {"first" : "Nuwan", "last" : "Rupasinghe"}, {"first" : "Dirk", "last" : "Biermann"}, {"first" : "Peter", "last" : "Eberhard"} ], "volume": "11","pages": "1851\u20131862","abstract": "Ejector deep hole drilling achieves high-quality boreholes in production processes. High feed rates are applied to ensure a high productivity level, requiring reliable chip removal from the cutting zone for a stable process. Therefore, a constant metalworking fluid flow under high volume flow rates or high pressure is required. Experimental results show a vortex formation at the outer cutting edge. This vortex can lead to delayed chip removal from the cutting zone, and ultimately, it can lead to chip clogging and result in drill breakage due to increased torque. This paper investigates modified drill head designs using the smoothed particle hydrodynamics method. The investigated modifications include various designs of the chip mouth covering. Besides graphical analysis based on flow visualizations, flow meters are placed at the tool's head to evaluate the impact of the modifications on the flow rate and possible increased resistance and relocation of the fluid flow from the outer cutting edge to other parts of the tool. The simulation results for the reference design show the experimentally observed vortex formation, validating the simulation model. By adding the tool's rotation in the SPH simulation, which is not included in the experiments for observation reasons, the vortex formation is positively influenced. In addition, some designs show promising results to further mitigate the vortex formation while maintaining a sufficient fluid flow around the cutting edges.", "issn" : "2196-4386", "doi" : "10.1007/s40571-024-00789-w", "bibtexKey": "Baumann2024" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2100a72d566555bffd8e3ee96fa8cab4b/andreasbaumann", "tags" : [ "dem","myown","sph" ], "intraHash" : "100a72d566555bffd8e3ee96fa8cab4b", "interHash" : "12a9ba01cf486cdd04ceced55567e65a", "label" : "Experimental collisions of varying roughness wetted particles in the pendular regime compared to numerical simulations", "user" : "andreasbaumann", "description" : "", "date" : "2024-05-22 08:05:24", "changeDate" : "2024-05-22 08:05:24", "count" : 2, "pub-type": "article", "journal": "Phys. Rev. Fluids","publisher":"American Physical Society", "year": "2024", "url": "https://link.aps.org/doi/10.1103/PhysRevFluids.9.054302", "author": [ "Oscar J. Punch","Daniel J. Holland","Andreas Baumann","Peter Eberhard" ], "authors": [ {"first" : "Oscar J.", "last" : "Punch"}, {"first" : "Daniel J.", "last" : "Holland"}, {"first" : "Andreas", "last" : "Baumann"}, {"first" : "Peter", "last" : "Eberhard"} ], "volume": "9","number": "5","pages": "054302-1 -- 054302-26","abstract": "Numerical simulations of wet particles often use the particle roughness as a minimum separation criterion to limit the viscous force. Here we investigate the validity of this through a comparison of experiments of binary wet particle collisions to numerical discrete element method (DEM) and smoothed particle hydrodynamics (SPH) simulations.", "numpages" : "26", "doi" : "10.1103/PhysRevFluids.9.054302", "bibtexKey": "PhysRevFluids.9.054302" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2510d18cb5acc0d1fdbd6a35d0c334e45/andreasbaumann", "tags" : [ "dem","myown","sld","sph" ], "intraHash" : "510d18cb5acc0d1fdbd6a35d0c334e45", "interHash" : "16d8b0a1f634f6da677eaedf6dacf98a", "label" : "Investigation of Chip Jamming in Deep-Hole Drilling", "user" : "andreasbaumann", "description" : "", "date" : "2023-06-29 16:21:24", "changeDate" : "2023-12-13 16:39:23", "count" : 1, "pub-type": "inproceedings", "year": "2023", "url": "", "author": [ "Andreas Baumann","Peter Eberhard" ], "authors": [ {"first" : "Andreas", "last" : "Baumann"}, {"first" : "Peter", "last" : "Eberhard"} ], "editor": [ "Georgios Fourtakas" ], "editors": [ {"first" : "Georgios", "last" : "Fourtakas"} ], "eventtitle" : "17th International SPHERIC Workshop", "venue" : "Rhodes, Greece", "eventdate" : "27-29 June 2023", "doi" : "http://dx.doi.org/10.18419/opus-13807", "bibtexKey": "baumann2023investigation" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/24e65532c85404ad17b817ec91c9703c5/andreasbaumann", "tags" : [ "cfd","myown","sld","sph" ], "intraHash" : "4e65532c85404ad17b817ec91c9703c5", "interHash" : "630ba3441a51d24560fb9d43e51b4ae7", "label" : "Geometry modifications of single-lip drills to improve cutting fluid flow", "user" : "andreasbaumann", "description" : "", "date" : "2022-06-01 13:58:24", "changeDate" : "2022-06-22 06:27:03", "count" : 2, "pub-type": "article", "journal": "The International Journal of Advanced Manufacturing Technology", "year": "2022", "url": "https://doi.org/10.1007/s00170-022-09400-z", "author": [ "Andreas Baumann","Ekrem Oezkaya","Dirk Biermann","Peter Eberhard" ], "authors": [ {"first" : "Andreas", "last" : "Baumann"}, {"first" : "Ekrem", "last" : "Oezkaya"}, {"first" : "Dirk", "last" : "Biermann"}, {"first" : "Peter", "last" : "Eberhard"} ], "volume": "121","number": "3","pages": "1689\u20131695","abstract": "For single-lip drills with small diameters, the cutting fluid is supplied through a kidney-shaped cooling channel inside the tool. In addition to reducing friction, the cutting fluid is also important for the dissipation of heat at the cutting edge and for the chip removal. However, in previous investigations of single-lip drills, it was observed that the fluid remains on the back side of the cutting edge, and accordingly, the cutting edge is insufficiently cooled. In this paper, a simulation-based investigation of an introduced additional drainage flute and flank surface modifications is carried out using smoothed particle hydrodynamics as well as computational fluid dynamics. It is determined that the additionally introduced drainages lead to a slightly changed flow situation, but a significant flow behind the cutting edge and into the drainage flute cannot be achieved due to reasons explained in this paper. Accordingly, not even a much larger drainage flute with unwanted side-effect of a decrease tool strength is able to archive a significant improvement of the flow around the cutting edge. Therefore, major changes to the cooling channel, like the use of two separate channels, the modification of their positions, or modified flank surfaces, are necessary in order to achieve an improvement in lubrication of the cutting edge and heat dissipation.", "issn" : "1433-3015", "doi" : "10.1007/s00170-022-09400-z", "bibtexKey": "BaumannEtAl22" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2cda17119e56b6f9409da7bbd427db079/andreasbaumann", "tags" : [ "cfd","dem","myown","sld","sph" ], "intraHash" : "cda17119e56b6f9409da7bbd427db079", "interHash" : "546d46b1bcf027f9d42cad546fb07cd7", "label" : "Analysis of the cutting fluid behavior with a modified micro single-lip deep hole drilling tool", "user" : "andreasbaumann", "description" : "", "date" : "2022-05-01 12:08:54", "changeDate" : "2022-06-01 15:43:42", "count" : 1, "pub-type": "article", "journal": "CIRP Journal of Manufacturing Science and Technology","publisher":"Elsevier BV", "year": "2022", "url": "https://doi.org/10.1016%2Fj.cirpj.2022.04.003", "author": [ "Ekrem Oezkaya","Andreas Baumann","Peter Eberhard","Dirk Biermann" ], "authors": [ {"first" : "Ekrem", "last" : "Oezkaya"}, {"first" : "Andreas", "last" : "Baumann"}, {"first" : "Peter", "last" : "Eberhard"}, {"first" : "Dirk", "last" : "Biermann"} ], "volume": "38","pages": "93--104", "doi" : "10.1016/j.cirpj.2022.04.003", "bibtexKey": "Oezkaya_2022" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/239980fafb80e64ccfdceb78838cacf44/andreasbaumann", "tags" : [ "CFD","DEM","SLD","SPH","myown" ], "intraHash" : "39980fafb80e64ccfdceb78838cacf44", "interHash" : "55c4edef520940e0544cdaa01ea63701", "label" : "Cutting fluid behavior under consideration of chip formation during micro single-lip deep hole drilling of Inconel 718", "user" : "andreasbaumann", "description" : "", "date" : "2022-03-17 16:30:11", "changeDate" : "2022-04-12 13:23:17", "count" : 3, "pub-type": "article", "journal": "International Journal of Modelling and Simulation","publisher":"Taylor & Francis", "year": "2022", "url": "/brokenurl# https://doi.org/10.1080/02286203.2022.2042057 ", "author": [ "Ekrem Oezkaya","Andreas Baumann","Sebastian Michel","Dirk Schnabel","Peter Eberhard","Dirk Biermann" ], "authors": [ {"first" : "Ekrem", "last" : "Oezkaya"}, {"first" : "Andreas", "last" : "Baumann"}, {"first" : "Sebastian", "last" : "Michel"}, {"first" : "Dirk", "last" : "Schnabel"}, {"first" : "Peter", "last" : "Eberhard"}, {"first" : "Dirk", "last" : "Biermann"} ], "pages": "1-15","abstract": "ABSTRACTWhen micro-single-lip deep hole drilling the efficiency of the cutting fluid supply cannot be investigated experimentally due to the inaccessibility of the cutting zone. For this reason, this paper examines the cutting fluid behavior, taking into account the chip formation and the transient chip position, with the help of various combined simulation methods. Therefore, experimentally obtained chips are digitalized and converted into a Computer-Aided Design model for the following simulations. Furthermore, for a comparison of the simulations with the experiments, the velocity of the cutting fluid in the chip flute of the tool is measured by a similar Particle Image Velocimetry method. Then, a transient coupled particle simulation of Smoothed Particle Hydrodynamics and the Discrete Element Method is performed to obtain the transient chip positions along the chip flute under the influence of the cutting fluid. Based on these chip positions, a Computational Fluid Dynamics simulation follows to derive insights about the flow field and pressure field at certain points in time. This multi-physics simulation chain allows to deal with experimental results in a simulation context to gain further insights about the deep hole drilling process, which are experimentally inaccessible and allows further connections between experiment and simulation.", "eprint" : "https://doi.org/10.1080/02286203.2022.2042057", "doi" : "10.1080/02286203.2022.2042057", "bibtexKey": "doi:10.1080/02286203.2022.2042057" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/273aa5c254aa86fff5ebbc441b736e8a3/andreasbaumann", "tags" : [ "CFD","DEM","SPH","myown" ], "intraHash" : "73aa5c254aa86fff5ebbc441b736e8a3", "interHash" : "c1e079e7c3c447ed9255c49705d05fa7", "label" : "Cutting-fluid flow with chip evacuation during deep-hole drilling with twist drills", "user" : "andreasbaumann", "description" : "", "date" : "2022-03-17 16:22:22", "changeDate" : "2022-04-12 13:23:34", "count" : 2, "pub-type": "article", "journal": "European Journal of Mechanics - B/Fluids","publisher":"Elsevier BV", "year": "2021", "url": "https://doi.org/10.1016%2Fj.euromechflu.2021.07.003", "author": [ "Andreas Baumann","Ekrem Oezkaya","Dirk Schnabel","Dirk Biermann","Peter Eberhard" ], "authors": [ {"first" : "Andreas", "last" : "Baumann"}, {"first" : "Ekrem", "last" : "Oezkaya"}, {"first" : "Dirk", "last" : "Schnabel"}, {"first" : "Dirk", "last" : "Biermann"}, {"first" : "Peter", "last" : "Eberhard"} ], "volume": "89","pages": "473--484", "doi" : "10.1016/j.euromechflu.2021.07.003", "bibtexKey": "Baumann_2021" } ] }