How to plot velocity Vs time graph at a point in a flow using starccm+

TQIM · November 9, 2012, 02:58

I m trying to plot a graph of velocity magnitude vs time at a point in a turbulent flow over a flat plate using point probe but i m unable to get a graph. Can anyone help me in sorting out this problem.

Thanks
TQIM

Zeppo · November 9, 2012, 16:43

Create an expression report.
Set your point derived part as an input part for it.
Define a report expression as sqrt($$Velocity[0]^2+$$Velocity[1]^2+$$Velocity[2]^2).
Create a monitor and a plot from your report.
Go to the monitor properties and switch the trigger from 'every iteration' to 'every time step'.

rwryne · November 12, 2012, 09:19

Quote:

Originally Posted by Zeppo

Create an expression report.
Set your point derived part as an input part for it.
Define a report expression as sqrt($$Velocity[0]^2+$$Velocity[1]^2+$$Velocity[2]^2).
Create a monitor and a plot from your report.
Go to the monitor properties and switch the trigger from 'every iteration' to 'every time step'.

You could probably just use a sum report and only include that point.

Also, I think $$Velocity.mag() would be easier than doing the full equation.

abdul099 · November 15, 2012, 20:26

Again, rwryne is right. There is a field function syntax to get the velocity magnitude, but isn't it mag($$Velocity)? At least that's what the user guide tells on page 4784.

Anyway, on an expression report, you can't choose any input parts, so it needs to be a sum, minimum or maximum report. All other reports don't make much sense.

TQIM · November 19, 2012, 02:18

Thanks for your reply...I tried with the expression given by you but its giving syntax error. Could you please tell me how to rectify this error.

TQIM · November 19, 2012, 02:20

Thanks Ryne for your reply but I m getting syntax error when I used the expression given by you. Could you please tell me how to rectify this error.

triple_r · November 19, 2012, 11:51

Can you post the error message? I think the following post gives the correct syntax

Quote:

Originally Posted by abdul099

Again, rwryne is right. There is a field function syntax to get the velocity magnitude, but isn't it mag($$Velocity)? At least that's what the user guide tells on page 4784.

Anyway, on an expression report, you can't choose any input parts, so it needs to be a sum, minimum or maximum report. All other reports don't make much sense.

November 9, 2012, 02:58	How to plot velocity Vs time graph at a point in a flow using starccm+	#1
TQIM New Member Taryk Join Date: Nov 2012 Posts: 9 Rep Power: 14	I m trying to plot a graph of velocity magnitude vs time at a point in a turbulent flow over a flat plate using point probe but i m unable to get a graph. Can anyone help me in sorting out this problem. Thanks TQIM

November 15, 2012, 20:26		#4
abdul099 Senior Member Join Date: Oct 2009 Location: Germany Posts: 636 Rep Power: 22	Again, rwryne is right. There is a field function syntax to get the velocity magnitude, but isn't it mag($$Velocity)? At least that's what the user guide tells on page 4784. Anyway, on an expression report, you can't choose any input parts, so it needs to be a sum, minimum or maximum report. All other reports don't make much sense. Kummi likes this. __________________ We do three types of jobs here: GOOD, FAST AND CHEAP You may choose any two!

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November 9, 2012, 16:43		#2
Zeppo Senior Member Sergei Join Date: Dec 2009 Posts: 261 Rep Power: 22	Create an expression report. Set your point derived part as an input part for it. Define a report expression as sqrt($$Velocity[0]^2+$$Velocity[1]^2+$$Velocity[2]^2). Create a monitor and a plot from your report. Go to the monitor properties and switch the trigger from 'every iteration' to 'every time step'.

November 19, 2012, 02:18		#5
TQIM New Member Taryk Join Date: Nov 2012 Posts: 9 Rep Power: 14	Thanks for your reply...I tried with the expression given by you but its giving syntax error. Could you please tell me how to rectify this error.

November 19, 2012, 02:20		#6
TQIM New Member Taryk Join Date: Nov 2012 Posts: 9 Rep Power: 14	Thanks Ryne for your reply but I m getting syntax error when I used the expression given by you. Could you please tell me how to rectify this error.