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An integrated model for complex flow simulations: COMSIM

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  1. Tez No: 400135
  2. Yazar: KUTSİ SAVAŞ ERDURAN
  3. Danışmanlar: DR. VEDRANA KUTİJA
  4. Tez Türü: Doktora
  5. Konular: İnşaat Mühendisliği, Civil Engineering
  6. Anahtar Kelimeler: Belirtilmemiş.
  7. Yıl: 2001
  8. Dil: İngilizce
  9. Üniversite: University of Newcastle upon Tyne
  10. Enstitü: Yurtdışı Enstitü
  11. Ana Bilim Dalı: Belirtilmemiş.
  12. Bilim Dalı: Belirtilmemiş.
  13. Sayfa Sayısı: 349

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Özet (Çeviri)

Developments in computer technology and numerical techniques have enabled thedevelopment of models, by which more complicated flow processes can be simulatedand by which optimal solutions to water resource and environmental problems can bereached. In this study an integrated model (COMSIM), capable of simulatingparticularly complex flows such as flow through flexible vegetation and discontinuousflow, has been developed.COMSIM can deal with a quasi-three dimensional (Q3D) surface flow simulationincluding the influence of additional flow resistance caused by vegetation, which couldbe submerged or non-submerged and flexible or inflexible. Moreover, it can also handleinteractions of two-dimensional (2D) saturated groundwater and surface water flows.Q3D algorithms use the solution of the 2D shallow water equations (SWE). Thesolution is based on the finite volume method (FVM) with shock capturing scheme(s).Five well-known first and second order accurate shock capturing schemes used in theFVM have been implemented in the model. These schemes are HLL, HLLC, Roe,Osher and flux vector splitting schemes. An attempt is also made to develop a solutionfor simulation of flow in a channel with a step on its bottom and encouraging resultshave been obtained. Second order accuracy in space is achieved using a variableextrapolation method whereas second order accuracy in time is provided in twoalternative ways; van Leer to Hancock method and a predictor-corrector method. Simple2D groundwater equations are also solved by the FVM.The performance of the first and second order shock capturing schemes in terms ofaccuracy, applicability, computation time and stability have been assessed by applyingthe model to a number of test cases. The results of this work are considered to bevaluable contributions to the ongoing research in the use of the shock capturing schemesin the FVM for the solution of the SWE. COMSIM has been applied to a micro-scalewetland project involving interactions of surface and subsurface flows. The results havebeen found to be promising. The influences of various vegetative characteristics such asthe height, stiffness and diameter of a reed on the flow behaviour have beeninvestigated. COMSIM has been tested and validated with published experimentalresults and agreement was satisfactory.

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