The request of the inital data for examples

[Kim1230]

Hello,
When I want to implement the code on my computer. I find the code needs to open ./initial/u.dat file etc. Are these files will be generated automatically or I need to predefine them? If these files need to be predefined, can you share these files?
Thanks

[dueben]

Hello,
I cannot look into the code just now but I think there is a switch whether or not the model is started from restart fields (then you need the files), or from rest (then you should not need these files). The model will need some time to spin-up, so there is a point in starting reduced precision analysis from restart files. The model output can be used as restart files at a certain point in time. Does this help?
All the best,
Peter

[Kim1230]

Thanks for your response. I have two questions that need your help. The first question is when I want to read the code with the associated paper rpe v5: an emulator for reduced floating-point precision in large numerical simulations. I can't understand the real meaning of some attributes in the code. Such as

. The attribute g you have declared but doesn't use in the code. I just wanna know if there has some detailed explananation or paper that I should pre-read to understand the code?
And the second question is that what tool you used to display the output?
Thanks a lot

[dueben]

Slip is a parameter that defines whether free-slip or no-slip boundary conditions are used. g is the gravitational acceleration, rho0 had something to do with density but both of the parameters may not be used in the final version of the code. h0 is the offset of the density of the fluid, I think, as in h=h0+h'

I used gnuplot to plot the results a couple of years ago... but the files have the form of a table and are probably also plotable with other tools.

"RHS" is standing for "Right Hand Side" of the equation.

[samhatfield]

You might also like to consult this alternative version of the shallow water model, which is based on the reference one in this repository: https://github.com/samhatfield/fugaku_toys/tree/master/shallow_water

It's simpler in some respects and includes a script for converting the model output to NetCDF. But it doesn't have the Reduced Precision Emulator. You will also need to change the compiler to GNU or something, since it is designed for running on Fugaku.

[Kim1230]

Thanks for your response. And I have a math problem to understand the code and the associated paper. The code

I surf on the line and find the Bernoulli principle and can't deduce to the Bernoulli potential. Can you give me some references?
And the output of the file.

it will have h(i,j), dh(i,j,1) and dh(i,j,2). Why it has dh(i,j,1) and dh(i,j,2)? Is that becuase of the Adams-Bashforth method?
Waiting for your reponse
Thanks!