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Dear Forum,

I have a serious understanding problem with the bulk method for estimating evaporative heat flux.

From my understanding the following holds (using a measured average evap rate):
...

Just wanted to let you know that I used reflective boundary conditions and the model works now.

e.g. northern boundary:

do i=1,lon
T(i,lat) = T(i,lat-1)
enddo

thanks, I wasn't aware of that convention.

I used the following code to print it on screen in the accustomed way:


uu = transpose(u)

!
! print the result
!

Hi Vinu,

I chose the cyclic boundary conditions mainly as a 'debugging' help, to see if I introduced some unintentional sources or sinks due to faulty programming in my scheme. Figuring out the...

These are the dynamics that should appear (result when initial cond. are the same on all grid points):

Dear Forum,

I tried to force a spatial NPZ model (based on franks (1986)) with an advection-diffusion tracer equation, using centered space and centered time (leapfrog) finite differences. The...

Great thanks for the references! Does anyone know if there is some 'numerical recipe' code out there in the net for langrangian dispersal techniques?

Hi Vinu,

thank you for the explanation! I haven't thought about that.
I have found another application of the model at:
http://ic.ucsc.edu/~ammoore/ocea290g/MATLAB/
(the file is called 'shallow...

Hi Vinu,

thank you very much! That was indeed the problem. Finding mistakes like that in code can be quite frustrating.
Thanks, I already found your post about the CFL shortly after made my post...

Maybe I'll post the numerical schemes here, so one doesn't have to download the file.

The integration scheme (centered in time and space):


for j=2:jmax-1
for i=2:imax-1
...

Dear Forum,
i have tried to translate the rgmodel fortran code into a matlab file, but even though i have choosen a real small timestep compared to delta_x, the model keeps 'blowing' up, if I use a...

Hi,

thanks for the references, I'll have a look through them.

Cheers,
Malte

Sorry for the post.
Have found the explanation of the CFL cond. now.

Dear Forum,

does anyone know a good textbook (or other references) that covers easy and basic explanations of lagrangian particle dispersion models and their application in hydrodynamics?

Thank...

Hello Vinu,

first of all thank you very much for the answer! I will try to do the discretization again within the next days with your tips.
Unfortunately our universtiy library hasn´t the book...

Dear Vinu,

first at all thanks for the code and the description in the other thread. I understand most of it but have some problems understanding the discretization of the differential equations....