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-   -   2D Transient flow using Fidap (http://www.cfd-online.com/Forums/fluent/34084-2d-transient-flow-using-fidap.html)

Young July 1, 2004 00:28

2D Transient flow using Fidap
 
Hi,

I am studying 2D Channel flow using Fidap... I have been used Fidap for a couple of weeks, so I am still a beginner. My problem is the following and the fluid is water.

____________|---|__________

inlet

____________|---|__________ outlet

I have solved 2D transient flow already, but I don't know how to check the results. Furthermore I don't know whether the input parameters are right or wrong. I was consulting only the Fidap manual and examples. I used Fiprep parameters from one of the examples.

I just need to obtain results at t = 0, 1,2, ....10000 (just guessing). I found that in the pull-down menu Fipost/plot/movie, though I am unsure whether it is right or wrong. If it is right, I would like to use the movie menu to get different flow structures for different times.

Please, help me.

The following are my Fiprep parameters:

FIPREP( )

PROBLEM( ADD, 2-D, INCO, TRANSIENT, LAMI, NONL, NEWT, MOME, ISOT, FIXE, NOST,

NORE, SING )

TIMEINT( TRAP, NSTEPS=10, TSTART=0, DT=10, VARI=1, NOFIXED=5 )

PRESSURE( ADD, PENA = 1e-08, DISC )

EXECUTION( ADD, NEWJOB )

SOLUTION( ADD, S.S. = 20, VELC = 0.0001, RESC = 0.0001, ACCF = 0 )

RENUMBER( ADD, PROF )

DENSITY( ADD, SET = 1, CONS = 1 )

VISCOSITY( ADD, SET = 1, CONS = 1 )

ENTITY( ADD, NAME = "fluid", FLUI )

ENTITY( ADD, NAME = "inlet", PLOT )

ENTITY( ADD, NAME = "outlet", PLOT )

ENTITY( ADD, NAME = "wall", PLOT )

ICNODE(VELOCITY, STOKES)

ICNODE(VELOCITY, ZERO)

DATAPRINT(NORr2M)

PRINTOUT(ALL)

POSTPROCESS(ADD, ALL, NOPT, NOPA)

BCNODE(ADD, VELOCITY, ENTI="wall", ZERO, INCL)

BCNODE(ADD, UX, ENTI="inlet", CONS=100, INCL)

BCNODE(ADD, UY, ENTI="inlet", ZERO, INCL)

END()

CREATE(FISO)

mario July 2, 2004 12:02

Re: 2D Transient flow using Fidap
 
Hi Young:

You can use some commands of fipost for transient analysis:

MOVIE: shows diferents steps calculated, the tipe step that you set in TIMEINTEGRATION and POSTPROCES, both in FIPREP. For example: you write MOVIE in the input commands of fipost(or use the boton Movie and click with the mouse) and then you need choice a magnitude, for example VECTOR(velocity). You will see the first step of the results, if you click on redraw in the navigation menu you will move forward on time and will see the next step and so.

HISTORY: shows a cartesian plot with a freedom degree versus time over a node of your choising.

TIMESTEP: Whe you start FIPOST, it always shows te resuts of the first timestep. You can shift the time using TIMESTEP. If you put the value (-1) , withou brakets, you will have the full list of the step recovered by FISOLV.

Well, I hope that this command will be usefull for you.

Mario



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