how to write a variable into a file along run-time?

huangxianbei · March 12, 2014, 07:49

Hi,foamers:

Recently I'm doing a calculation using channelFoam. In this solver, gradP is identified and write to the log file during run-time. But I want to use it's data to calculate the u_tau, does anyone knows how to make it written into a file like p or U? Or can I extract the data from the log file ?

The log file looks like the following

Code:

time step continuity errors : sum local = 4.49932e-10, global = -1.2018e-19, cumulative = 1.33261e-18
Uncorrected Ubar = 0.1335    pressure gradient = 6.14588e-05
ExecutionTime = 1.51 s  ClockTime = 2 s

The pressure gradient is what I want to extract.

huangxianbei · March 12, 2014, 08:36

OK, the problem is solved through the 'grep' command. You can just use grep to search the log file and output the pressure gradient.

March 12, 2014, 07:49	how to write a variable into a file along run-time?	#1
huangxianbei Senior Member Huang Xianbei Join Date: Sep 2013 Location: Yangzhou,China Posts: 302 Rep Power: 13	Hi,foamers: Recently I'm doing a calculation using channelFoam. In this solver, gradP is identified and write to the log file during run-time. But I want to use it's data to calculate the u_tau, does anyone knows how to make it written into a file like p or U? Or can I extract the data from the log file ? The log file looks like the following Code: time step continuity errors : sum local = 4.49932e-10, global = -1.2018e-19, cumulative = 1.33261e-18 Uncorrected Ubar = 0.1335 pressure gradient = 6.14588e-05 ExecutionTime = 1.51 s ClockTime = 2 s The pressure gradient is what I want to extract.

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March 12, 2014, 08:36		#2
huangxianbei Senior Member Huang Xianbei Join Date: Sep 2013 Location: Yangzhou,China Posts: 302 Rep Power: 13	OK, the problem is solved through the 'grep' command. You can just use grep to search the log file and output the pressure gradient.