Hamid Reza Madihi - M.Sc. Coastal Environmental Engineering, Graduate Faculty of Environment, Tehran University, Tehran, Iran
Bagher Keshtgar - M.Sc. Coastal Environmental Engineering, Graduate Faculty of Environment, Tehran University, Tehran, Iran
Sina Hosseini Fard - M.Sc. Coastal Environmental Engineering, Graduate Faculty of Environment, Tehran University, Tehran, Iran

The recent paper concentrates two subjects: How can a user of the programs estimates the exactness of the program, and how should the programs be planned to assist this user in this role. Usual uncertainties in computational fluid dynamics (CFD) results include numerical errors, modeling errors, program insects and mistakes in input parameters and boundary conditions. The mistakes can be assessed using itemized results from the CFD program together with its documentation. Each uncertainty can be assessed by evaluating the variables against each other, parameter responsiveness examinations and testing for simplified items. The role is made easier if the program is as transparent as possible. This means that the user can see the values of all the pertinent variables and mediatory results for the whole computational domain. Together with an extensive collection of documents of the computer program that includes all the formulas used, the user can be able to find the causes of suspect results, including an estimation of possible bugs. An important tool in the testing of a CFD program is using simplified cases, generally channels with uniform one-dimensional flow where the user.

Sediment, Models, CFD, Transport