CFD Online Discussion Forums - Is adjustableRunTime link to the Time shown in the log?

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Is adjustableRunTime link to the Time shown in the log?

Hi,

In the log, there are few places where the time is shown :

Code:

ExecutionTime = 0.92 s  ClockTime = 1 s



Courant Number mean: 1.2100784e-05 max: 0.009442947

deltaT = 3.5831613e-06

Time = 1.5499037e-05

In the manual

Quote:

- adjustableRunTime Writes data every writeInterval seconds of simulated time,
adjusting the time steps to coincide with the writeInterval if
necessary — used in cases with automatic time step adjustment.

Is "seconds of simulated time" referring to the Time value in the log?
If so , this is not very useful because my simulations never reached the second. Mostly a few tenths of second. I would like to print every few microseconds in my case while using adjustableTimeStep.

I tried cpuTime and clockTime and is shows what is says,
runTime and adjustableRunTime do not.

Is this normal behaviour?

Quote:

Originally Posted by jam (Post 369096)

Hi,

In the log, there are few places where the time is shown :

Code:

ExecutionTime = 0.92 s  ClockTime = 1 s



Courant Number mean: 1.2100784e-05 max: 0.009442947

deltaT = 3.5831613e-06

Time = 1.5499037e-05

In the manual
Is "seconds of simulated time" referring to the Time value in the log?
If so , this is not very useful because my simulations never reached the second. Mostly a few tenths of second. I would like to print every few microseconds in my case while using adjustableTimeStep.

The adjustableRunTime option is used with unsteady simulations, when you have an adaptive time-stepping. It saves the simulation result every "writeInterval", making sure that the exact interval between one set of saved data and the following is enforced.

Example: Let's assume you set

Code:

writeControl    adjustableRunTime;



writeInterval   0.01;

in your controlDict. OpenFOAM will save data every 0.01s. If you want to save every microsecond of flow time (What is indicated as "Time" in the logs), you should set:

Code:

writeInterval 1.0e-6;

Best,

Thank you,
I should have read the manual more carefully. It is in the book.