| Author | Rahman, Khondker Rezaur |
| Call Number | AIT Thesis no.WA-86-13 |
| Subject(s) | Hydrodynamics--Mathematical models
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| Note | A thesis submitted in partial fulfilment of the requirements for the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Abstract | Two-dimensional depth averaged flow computations are made with the help of hydrodynamic models for different flow situations. Most of the existing models have succeeded to simulate the real flow situations. But the degree of accuracy in computations calls for the comparison between the models with respect to their simulating capabilities. The present study deals with two hydrodynamic models namely, the pseudo-viscosity shear stress distribution model and the k-e turbulence model, and efforts have been made to compare between them. The first step of this research, aims to compute the flow fields in two pool channel configurations and then the effects on flow fields due to the variations of flow parameters and numerical parameters involved in the models, have been studied. Circulating flow phenomenon have been observed from the model computations and it has also been noticed that the change of parameters involved with the effective shear stresses causes change in the circulation pattern in case of t he pseudo viscosity model. On the other hand, non uniform grid spacing (i.e., closest spacing near the physical boundaries and wider apart from the boundaries) in the k- e model creates sensitive response to the turbulence structure of t he flow domain as well as the circulation pattern. Effect of bed resistance has been found negligible and circulation pattern has been obtained even under smooth bed condition. The second step of the study tries to find a suitable mean to establish certain relationships between the parameters involved in the models under considerations and flow computations are performed on the basis of those relationships. Unfortunately, this computed flow pattern failed to agree with the real flow situation. The causes of these failure is then found out. Finally, It has been recommended to make further analytical approaches to find a suitable relationship between the models. |
| Year | 1986 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Water Resources Research Engineering (WA) |
| Chairperson(s) | Tawatchai Tingsanchali |
| Examination Committee(s) | Suphat Vongvisessomjai ;Gupta, Ashim Das |
| Scholarship Donor(s) | CIDA, Canada |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1986 |