# Calculate a converged flow solution

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 May 23, 2007, 14:34 Calculate a converged flow solution #1 kumar Guest   Posts: n/a Hey, I am currently using fluent version 6 to model the flow past a 2D circular cylinder. I have created a mesh using Gambit. after exporting the files to fluent and reading the file what do i do now ? what solver do i use ? how do i check or make the solution onverge ? What is the purpose of setting the force monitors (drag, lift and moment) ? How i do calculate a converged flow solution ? Please help me !

 May 24, 2007, 01:33 Re: Calculate a converged flow solution #3 kumar Guest   Posts: n/a Hey Donovan, Thank you so much for your immediate response. I am studying the aerodynamically generated sound due to flow past a circular cylinder using fluent version 6.as stated in the manual, the first thing i need to do is to obtain a steady state converged flow solution. Now here are the steps that i have done. Drew and meshed the surface using gambit read it to fluent. went to grid-> check went to grid-> reorder-> domain i am currently investigating the flow past a cylinder with a reynolds number of 100. So, next i went to define->model->viscous-> laminar. next, define->materials->viscosity was set to 0.01, density was set to 1, velocity was set to 1 I then went on to define the boundary conditions. Went to solve-> control-> solution -> ok solve->monitors->residual-> activated the plot and left the default values -> ok Next i went to solve->monitors->force->activated the plot and write for the drag, lift and moment. Solve->initialise->compute from velocity inlet 1-> init iterate-> no of time steps taken was 200 with a time step step size of 0.1 s -> iterate The thing is why do i need to plot and write the drag, lift and moment ? how do i see from these 2 graphs and the residuals that the solution is converged? what is the definition of a solution being converged ? and and if it doesnt converge what do i do ? what parameters do i play with ? and finally how do i obtain this steady state converged solution ? also what solution do i use ? segregated or coupled ? implicit or explicit ? steady or unsteady ? as a beginner, i am using this case to study fluent and once i can get a hang of it ill be just fine Help me! Thanks

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