Hello,

Thank you for your e-mail. Based on the session file you have provided, you'll need to define the IO_FlowSteps parameter, given as

<PARAMETERS>
...
<P> IO_FlowSteps = 1000 </P>
...
</PARAMETERS>

Which would dump a .prs file that measures dp/dx (alpha) at every 1000 time-steps necessary to maintain the flowrate prescribed. 

For more information you could refer to the user-guide 11.10
https://doc.nektar.info/userguide/latest/user-guidese55.html#x76-36100011.10

Cheers,
Chi Hin




From: nektar-users-bounces@imperial.ac.uk <nektar-users-bounces@imperial.ac.uk> on behalf of 小已 <z2831727149@163.com>
Sent: 04 November 2024 03:04
To: nektar-users <nektar-users@imperial.ac.uk>
Subject: [Nektar-users] Failed to calculate the z-direction force in pipe flow
 

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Dear Nektar++  developers and users
I am a phd student from BIT(Beijing institute of technology), and I am using nektar++ to simulat turbulent pipe flow recently.
my simulation is a 3DH1D.The mesh is a circular. The flow direction is z-direction and expand with Fourier transform.The caculation only outputs the forces in the x and y directions and the moment of the z-direction. However,I want to get the force in the z-direction on the wall and the program is unable to output. Is there any methods to solve it? The mesh and parameter files are attached.