CEL expression

chirath2003 · March 29, 2010, 10:26

Hi there,

Im currently trying to simulate the effect of waves inside a domain with an object at the bottom (sea bed). The equations used are in the attachment but i get this error message about the units. A screen shot has been provided. Pls can you advice me what im doing wrong??

Thanks
Chirath

dvolkind · March 29, 2010, 15:09

The first thing You are doing wrong is providing screenshot instead of text. Have you tried viewing it?
Type the expression You fail to create and also all the related expressions. I'll try to check the dimensions.

chirath2003 · March 29, 2010, 17:48

HI there,

Sorry about that..i hope this txt file which contains the data would be useful to you in assisting me.

Thanks

Chirath

ghorrocks · March 29, 2010, 21:19

The error is obvious - your units are not correct. You will have to work the units through your equations to sort it out.

dvolkind · March 30, 2010, 03:37

Do not specify units twice, that's the reason of your problem. For example,
if H = 3 [m] and a = H/2 then CEL should be:
H = 3.0 [m]
a = H/2 {no dimension}
Your CEL is:
a = H/2 [m] means "H is divided by 2 AND by its dimension", that way "a" becomes dimensionless.
The same goes for the rest expressions.

chirath2003 · March 30, 2010, 06:33

Thanks both, really appreciate your help. Will try it out and see...

Cheers

Chirath

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March 29, 2010, 15:09		#2
dvolkind Member Dmitry Volkind Join Date: Jan 2010 Location: Ekaterinburg, Russia Posts: 64 Rep Power: 16	The first thing You are doing wrong is providing screenshot instead of text. Have you tried viewing it? Type the expression You fail to create and also all the related expressions. I'll try to check the dimensions.

March 29, 2010, 21:19		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,871 Rep Power: 144	The error is obvious - your units are not correct. You will have to work the units through your equations to sort it out.

March 30, 2010, 03:37		#5
dvolkind Member Dmitry Volkind Join Date: Jan 2010 Location: Ekaterinburg, Russia Posts: 64 Rep Power: 16	Do not specify units twice, that's the reason of your problem. For example, if H = 3 [m] and a = H/2 then CEL should be: H = 3.0 [m] a = H/2 {no dimension} Your CEL is: a = H/2 [m] means "H is divided by 2 AND by its dimension", that way "a" becomes dimensionless. The same goes for the rest expressions.

March 30, 2010, 06:33		#6
chirath2003 New Member Abhishek Join Date: Mar 2010 Posts: 7 Rep Power: 16	Thanks both, really appreciate your help. Will try it out and see... Cheers Chirath