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matteobernardini / STREAmS

Supersonic TuRbulEnt Accelerated navier stokes Solver
GNU General Public License v3.0
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Time step #10

Closed Sushmitha46 closed 1 year ago

Sushmitha46 commented 1 year ago

Hello, I am trying to understand at what actual time steps are field files getting generated. The time variable mentioned in output files are at intervals of 5 as specified by us using "dtsave", but what does the digit signify. And is the time step constant or does it vary? Thank you

davidem88 commented 1 year ago

I didn't understand the first question, what do you mean by "digit"? As for the time step, it is not constant. The time step is recomputed to keep a constant CFL number, specified in input.

Sushmitha46 commented 1 year ago

In dtsave = 5, you had told that it is a non dimensional time, by what time scale is it non-dimensionalised? If it is non dimensionalised using incoming boundary layer thickness and free stream velocity, then how do i interpret the value of boundary layer thickness and free stream velocity

davidem88 commented 1 year ago

The reference velocity is the speed of sound at the reference temperature (free-stream) and the boundary layer thickness at the inflow. Please refer to the documentation https://streams-cfd.github.io/STREAmS-2/manual/flow_cases.html#nondimensional-governing-equations