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-   -   Flow laminar and stationary of water in a pipe (https://www.cfd-online.com/Forums/openfoam-solving/59772-flow-laminar-stationary-water-pipe.html)

 manuel January 24, 2007 00:16

Hello everybody,

For academic purposes, I try to carry out a model of flow laminar and stationary of water in a pipe.

what should i use solver to solve my model, icoFoam, simpleFoam, turbFoam etc.
And which modifications i have to do.

beforehand thanks
I apologize for my questions, I am self-taught in CFD

 dmoroian January 24, 2007 04:12

I think the easiest way would

I think the easiest way would be to use simpleFoam and change in constant/turbulenceProperties:
turbulenceModel laminar;

Dragos

 manuel January 25, 2007 00:20

Thanks I try and later as

Thanks

I try and later ask questions

 manuel January 25, 2007 21:27

Hi

when i will do the model simple foam , i have some questions:

What i have put in the control dict, respect the time: starTime, endTime and deltaT, if the model is stady-state?

What value of K, epsilon, R nuTilda, i have to use at the walls, the in and out, so i do the model with the wedge condictions, about that only there is one wall and one inlet and autlet.

what value i have to do in the dict turbulenceProperties aside the laminar in the turbulenceModel?

I apologize for my questions, I am self-taught in CFD

Manuel

 mattijs January 26, 2007 05:46

deltaT is not used in any of t

deltaT is not used in any of the equations. The time is purely an iteration counter so set e.g.

deltaT = 1
startTime = 0
endTime = number_of_wanted_iterations

in turbulenceProperties set 'turbulence' to off. The choice of K,eps,R becomes irrelevant since they are not used in any calculation (they probably are not read as well)

 dmoroian January 26, 2007 05:51

All the time variable names in

All the time variable names in the controlDict will represent instead the iteration number.
Since you don't solve a turbulent flow, you don't need to specify anything for k, epsilon, R, nuTilda, because they are not computed; just remove those files from the time directory.

Dragos

 liamm March 24, 2007 19:23

hi I am trying to model simp

hi
I am trying to model simple laminar pipe flow in both openfoam and ansys cfx. I have completed the simulation however to get the same answer on openfoam as i do in cfx i have to do over three times the number of iterations. is there anything i can do with the solver settings to speed this up? they are all left at there default settings.
I am using simplefoam with the turbulence turned off

and is it possible to graph the convergence of the results through each iteration?

Thanks
Liam

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