Hi everyone, please somebody could help me with this problem.
I'm trying run this case called Test1, is for 1 year, but in this case is only 1 month (January 2014), the problem is that everytime the case stop for cause of this:
(' Blowing-up: Saving latest model state into RESTART file
REASON: MaxSpeed = 2.1E+01
WRT_RST_NF90 - wrote re-start fields (Index=1,1) in record = 3')
So, I don't really because it. I tried change time-step (Passed of 30 to 10 second), changed the DCRIT (of 0.1 to 2), but the problem still continue.
I'll append the caseout of cluster, .h and .in, if somebody could please help me to find the problem, i thankful it.
Good day for all!
Problem with BLOWUP REASON: MaxSpeed = 2.1E+01
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felipe.jbarragan7
- Posts: 21
- Joined: Tue Jul 04, 2023 3:22 pm
- Location: Universidad de Antioquia
Problem with BLOWUP REASON: MaxSpeed = 2.1E+01
- Attachments
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roms_test1_case.txt- (55 KiB) Downloaded 145 times
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- test1.h
- (943 Bytes) Downloaded 157 times
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- roms_test1.in
- (156.32 KiB) Downloaded 138 times
Re: Problem with BLOWUP REASON: MaxSpeed = 2.1E+01
Your open boundary conditions don't make sense.
You have periodic conditions for u,v but a mix of closed and Flather conditions for ubar, vbar. If u,v is periodic then ubar,vbar must be also. Without knowing more about your grid it's hard to say what to do, but since you have MASKING defined I presume you have some sort of "realistic" set-up and it's unlikely you want periodic conditions for anything.
Look at the Courant number guidance:
You are very close to 1, so the barotropic time step set by dtfast = dt/ndtfast is close to, or actually, unstable. dtfast should be smaller.
Your NDTFAST of 10 is smaller than recommended. Make this larger (say, 30) to see if that helps, after you've set sensible open boundary conditions.
You have NaNs in the very first time step output. I say this so many times on the User Forum ..... you can't have any NaNs in your initial conditions or boundary data, not even in the land mask.
Check that. NaNs in land can be set to any real number and the masking will take care of it, but anything times NaN is Nan so they propagate out of the land mask and into the water.
You have periodic conditions for u,v but a mix of closed and Flather conditions for ubar, vbar. If u,v is periodic then ubar,vbar must be also. Without knowing more about your grid it's hard to say what to do, but since you have MASKING defined I presume you have some sort of "realistic" set-up and it's unlikely you want periodic conditions for anything.
Look at the Courant number guidance:
Maximum barotropic Courant Number = 9.37921095E-01
You are very close to 1, so the barotropic time step set by dtfast = dt/ndtfast is close to, or actually, unstable. dtfast should be smaller.
Your NDTFAST of 10 is smaller than recommended. Make this larger (say, 30) to see if that helps, after you've set sensible open boundary conditions.
You have NaNs in the very first time step output. I say this so many times on the User Forum ..... you can't have any NaNs in your initial conditions or boundary data, not even in the land mask.
Check that. NaNs in land can be set to any real number and the masking will take care of it, but anything times NaN is Nan so they propagate out of the land mask and into the water.
John Wilkin: DMCS Rutgers University
71 Dudley Rd, New Brunswick, NJ 08901-8521, USA. ph: 609-630-0559 jwilkin@rutgers.edu
71 Dudley Rd, New Brunswick, NJ 08901-8521, USA. ph: 609-630-0559 jwilkin@rutgers.edu
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felipe.jbarragan7
- Posts: 21
- Joined: Tue Jul 04, 2023 3:22 pm
- Location: Universidad de Antioquia
Re: Problem with BLOWUP REASON: MaxSpeed = 2.1E+01
Thanks so much Dr. Wilkin for your suggestion and help.
I changed the boundary conditions based in the reality of case. (Is closed for East and South for the continent), but had the error in periodic conditions for u,v.
About the time-stepping parameters, changed based in his recommends.
Is very strange about the NaN data, I revised all the data and don't found nothing
. I hope that now the case don't stop for this.
Thanks for the help, the case is running now and the results i'm looking better than before.
I changed the boundary conditions based in the reality of case. (Is closed for East and South for the continent), but had the error in periodic conditions for u,v.
About the time-stepping parameters, changed based in his recommends.
Is very strange about the NaN data, I revised all the data and don't found nothing
. I hope that now the case don't stop for this. Thanks for the help, the case is running now and the results i'm looking better than before.