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Short circuit between transistors by water sloshing

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Old   October 2, 2013, 10:06
Default Short circuit between transistors by water sloshing
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Roland Rakos
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Hello,

I have a free surface problem which I would like to solve. There is a very simple electric panel with two small transistors in the center of panel. The panel is located in a closed box where includes a little water. If the closed box is in rest then the level of water can not reach the transistors. In my case, the box is located on the roof of a vehicle because the box generally is under a heavy excitation. This excitation can cause that the water level reaches the transistors which results a short circuit. In my simulation these short circuit should be checked and shown by a monitor in the function of time.
My simulation include the exact geometry, the initial level of water and the excitation signal. My problem is that the water sloshing (or the water drops) can cause the short circuit wherever. I should check and show the moments when the water makes contact between the transistors causing short circuit wherever in the flow field.
Any ideas?
Thanks a lot;
Roland
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Old   October 2, 2013, 17:53
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Glenn Horrocks
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I do not know what you are actually asking - but assuming you are asking how to tell if the water have reached the transistors.... Then I would put a monitor point at each transistor and output the water volume fraction. When the volume fraction is high at both transistors you have a short circuit.
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Old   October 3, 2013, 04:19
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Quote:
Originally Posted by ghorrocks View Post
I do not know what you are actually asking - but assuming you are asking how to tell if the water have reached the transistors.... Then I would put a monitor point at each transistor and output the water volume fraction. When the volume fraction is high at both transistors you have a short circuit.
Yes, you have right; I checked the short circuit with your suggestion already. It seemed correct but I think, it is not the most exactly. A transistor have for example three pins:

http://quarkstream.files.wordpress.c...w-diagram1.jpg

If the volume fraction of fluid is high in the monitorpoint (located in center of transistor) it is not sure that a short circuit occurred. Perhabs just a water drop is at the top of transistor. The water has to make contact between two pins, this is the real short circuit. But this contact can be wherever, and this is my problem.

Regards
Roland
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Old   October 3, 2013, 08:23
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Then put a monitor point on the three pins. If any two show water then you have a short.
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Old   October 3, 2013, 09:07
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Then put a monitor point on the three pins. If any two show water then you have a short.
OK, I try it with more points

Thanks
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