{"id":{"repo_id":"aachen","oai_identifier":"oai:publications.rwth-aachen.de:56729"},"canonical_url":"https://search.dev.ndltd.org/etd/aachen/oai:publications.rwth-aachen.de:56729","repository":{"repo_id":"aachen","name":"RWTH Aachen University","base_url":"https://publications.rwth-aachen.de/oai2d"},"display":{"title":"Numerical modeling of incompressible flow applied to casting processes","abstract":"Modern casting processes allow the precise production of parts with complex shapes. Especially mold filling is of importance, since many features of the cast part are determined in this stage of the process. Concerning the manufacturing of complex industrial parts with high quality even in small numbers, a reliable and predictive numerical simulation is an inevitable part of the production chain. The simulation program CASTS is based on finite element (FE) approximations. Recently a hybrid approach was developed combining the mathematics of finite elements with the technical advantages of the finite volume (FV) method. In this work a flow solver for the hybrid FE/FV method has been developed. This solver is based on an approximation of velocity and pressure of first order. Thus a stabilization is necessarily required. Hence bubble functions and static condensation are introduced into the FE/FV method. This way discrete bubble stencils are derived. The obtained bubble stabilization is limited for high Reynolds numbers by a conventional pressure stabilizing Petrov-Galerkin method. The stabilized FE/FV method is validated on several flow problems and applied to mold filling. The free surface is modeled using a phase field stabilized volume of fluid (VoF) method. Results on a T-branch test show a compact front and reasonable velocity and pressure fields. The fill and flow pattern on the 'MCWASP Benchmark 1995' widely agree with the experimental results.","abstract_html":"Modern casting processes allow the precise production of parts with complex shapes. Especially mold filling is of importance, since many features of the cast part are determined in this stage of the process. Concerning the manufacturing of complex industrial parts with high quality even in small numbers, a reliable and predictive numerical simulation is an inevitable part of the production chain. The simulation program CASTS is based on finite element (FE) approximations. Recently a hybrid approach was developed combining the mathematics of finite elements with the technical advantages of the finite volume (FV) method. In this work a flow solver for the hybrid FE/FV method has been developed. This solver is based on an approximation of velocity and pressure of first order. Thus a stabilization is necessarily required. Hence bubble functions and static condensation are introduced into the FE/FV method. This way discrete bubble stencils are derived. The obtained bubble stabilization is limited for high Reynolds numbers by a conventional pressure stabilizing Petrov-Galerkin method. The stabilized FE/FV method is validated on several flow problems and applied to mold filling. The free surface is modeled using a phase field stabilized volume of fluid (VoF) method. Results on a T-branch test show a compact front and reasonable velocity and pressure fields. 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Especially mold filling is of importance, since many features of the cast part are determined in this stage of the process. Concerning the manufacturing of complex industrial parts with high quality even in small numbers, a reliable and predictive numerical simulation is an inevitable part of the production chain. The simulation program CASTS is based on finite element (FE) approximations. Recently a hybrid approach was developed combining the mathematics of finite elements with the technical advantages of the finite volume (FV) method. In this work a flow solver for the hybrid FE/FV method has been developed. This solver is based on an approximation of velocity and pressure of first order. Thus a stabilization is necessarily required. Hence bubble functions and static condensation are introduced into the FE/FV method. This way discrete bubble stencils are derived. The obtained bubble stabilization is limited for high Reynolds numbers by a conventional pressure stabilizing Petrov-Galerkin method. The stabilized FE/FV method is validated on several flow problems and applied to mold filling. The free surface is modeled using a phase field stabilized volume of fluid (VoF) method. Results on a T-branch test show a compact front and reasonable velocity and pressure fields. The fill and flow pattern on the 'MCWASP Benchmark 1995' widely agree with the experimental results."]},{"key":"dc:source","label":"Dc Source","values":["Aachen : Publikationsserver der RWTH Aachen University 125 S. : Ill., graph. Darst. (2001). = Aachen, Techn. Hochsch., Diss., 2001"]},{"key":"dc:title","label":"Title","values":["Numerical modeling of incompressible flow applied to casting processes"]}]}],"canonical_facts":{"dc:contributor":["Sahm, Peter R."],"dc:coverage":["DE"],"dc:creator":["Neises, Jürgen"],"dc:date":["2001"],"dc:description":["Modern casting processes allow the precise production of parts with complex shapes. Especially mold filling is of importance, since many features of the cast part are determined in this stage of the process. Concerning the manufacturing of complex industrial parts with high quality even in small numbers, a reliable and predictive numerical simulation is an inevitable part of the production chain. The simulation program CASTS is based on finite element (FE) approximations. Recently a hybrid approach was developed combining the mathematics of finite elements with the technical advantages of the finite volume (FV) method. In this work a flow solver for the hybrid FE/FV method has been developed. This solver is based on an approximation of velocity and pressure of first order. Thus a stabilization is necessarily required. Hence bubble functions and static condensation are introduced into the FE/FV method. This way discrete bubble stencils are derived. The obtained bubble stabilization is limited for high Reynolds numbers by a conventional pressure stabilizing Petrov-Galerkin method. The stabilized FE/FV method is validated on several flow problems and applied to mold filling. The free surface is modeled using a phase field stabilized volume of fluid (VoF) method. Results on a T-branch test show a compact front and reasonable velocity and pressure fields. 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