Changing the range would blow up

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wavewatch
Posts: 11
Joined: Thu Nov 14, 2013 1:51 am
Location: institute of oceanology

Changing the range would blow up

#1 Post by wavewatch » Thu Jul 02, 2015 3:42 am

Hello,
I am trying to simulate the south China sea current, at the first stage I choose the range : -10—27N,99—140E, and it can run normally.

However, when I change the range , -10—27N,99—150E,it blow up after 187 days. Then I try to replace the NCEP wind field with QSCAT, dramatically it still blow up in 180 days or so. And both of them collapse in the similar position.

I don’t know whether it relevant with the complex topography or the model setting……

I’m very nervous, I don’t know what should I do!!
Any clues to why this is happening would be much appreciated – following a figure with the locations of the blow up points, header file,output and oceanin.[/size]
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blow up.jpg
output.txt
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oceanin.in
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header.h
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crowley
Posts: 11
Joined: Wed Mar 26, 2003 4:14 pm
Location: DOI/MMS

Re: Changing the range would blow up

#2 Post by crowley » Thu Jul 02, 2015 3:22 pm

I suspect the current velocities through that pass are just too high. Try reducing your timestep a little and see if that helps.

wavewatch
Posts: 11
Joined: Thu Nov 14, 2013 1:51 am
Location: institute of oceanology

Re: Changing the range would blow up

#3 Post by wavewatch » Fri Jul 03, 2015 1:33 am

I try to reduce the timestep from dt=400 to dt=200,the currnt velocity is still more than 2.5 meter per second on the fifth day. In addition, I try to increase horizontal diffusion and viscosity,but it still doesn't work.

Thank you in advance!

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kate
Posts: 3809
Joined: Wed Jul 02, 2003 5:29 pm
Location: CFOS/UAF, USA

Re: Changing the range would blow up

#4 Post by kate » Fri Jul 03, 2015 6:05 pm

I have better luck fussing with the bottom drag than with horizontal smoothing, especially for such a shallow area. Still, how large are the currents supposed to be there? What is your grid spacing? Do you have tides and do they look reasonable? Perhaps you don't care about that SE corner and you can simply mask it out.

Ahumada
Posts: 11
Joined: Fri Jul 13, 2007 3:01 pm
Location: Universidad del Mar

Re: Changing the range would blow up

#5 Post by Ahumada » Sat Jul 04, 2015 1:58 pm

Try with different degree of smoothing for bottom topography. For example, from strong to weak smoothing!


M.A.

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