section discharge vs time

saravenu · January 15, 2016, 04:29

HI=)
I would like to plot the discharge of one fluid through a section vs time (i.e the hydrograph). But the problem is that transient graphs allow to plot variables vs time just in one point.
I tried the following procedure but I don't think the result I get makes sense..Can you suggest me another strategy? This is what I did:
in the post processing I defined an expression "discharge" which compute the discharge as the area integral of the fluid velocity in the section of interest:
discharge=areaInt(fluid1.Velocity)@last section before the dam
then I created a graph specifying:
graph type: transient
data source: the expression discharge
x axe: the time variable
at this point I suppose the programme will plot the discharge in function of time but actually I have to specify also the y axe variable. This make me think I am not on the right road..
Thanks a lot for your help!
Sara

ghorrocks · January 15, 2016, 05:45

If you don't like the way CFD-Post does charting then export the data and use a graphing package you are familiar with. Things like excel, matlab, tecplot, python, gnuplot and many others are much easier to use and have more features.

January 15, 2016, 04:29	section discharge vs time	#1
saravenu New Member Sara Join Date: Dec 2015 Posts: 1 Rep Power: 0	HI=) I would like to plot the discharge of one fluid through a section vs time (i.e the hydrograph). But the problem is that transient graphs allow to plot variables vs time just in one point. I tried the following procedure but I don't think the result I get makes sense..Can you suggest me another strategy? This is what I did: in the post processing I defined an expression "discharge" which compute the discharge as the area integral of the fluid velocity in the section of interest: discharge=areaInt(fluid1.Velocity)@last section before the dam then I created a graph specifying: graph type: transient data source: the expression discharge x axe: the time variable at this point I suppose the programme will plot the discharge in function of time but actually I have to specify also the y axe variable. This make me think I am not on the right road.. Thanks a lot for your help! Sara

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January 15, 2016, 05:45		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,365 Rep Power: 139	If you don't like the way CFD-Post does charting then export the data and use a graphing package you are familiar with. Things like excel, matlab, tecplot, python, gnuplot and many others are much easier to use and have more features.