# Doubts in catalytic convertor tutorial

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 September 7, 2013, 07:06 Doubts in catalytic convertor tutorial #1 New Member   Kishore Join Date: Mar 2013 Posts: 20 Rep Power: 5 Dear all I have question in the catalytic converter tutorial. In the Global initialization tab they have introduced w= -2.8 m/s. Why in the tutorial the negative sign has been introduced instead of 2.8 m/s? I Need your help Thank you

 September 8, 2013, 06:29 #2 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 12,726 Rep Power: 99 Because the flow is in the negative w direction. Isn't that obvious?

September 8, 2013, 11:03
#3
New Member

Kishore
Join Date: Mar 2013
Posts: 20
Rep Power: 5
Quote:
 Originally Posted by ghorrocks Because the flow is in the negative w direction. Isn't that obvious?
If you are saying flow is in the negative w direction then input velocity may be negative sign (-25 m/s). then why the normal speed will be positive 25m/s ? is the normal speed means modulus of the velocity?

Thank you

Regards

 September 8, 2013, 19:33 #4 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 12,726 Rep Power: 99 When you define velocity at an inlet you just specify the magnitude. But for the initial condition you specify the full velocity vector. Hence the initial conditions is w=-2.8m/s, but the inlet is as positive number.

September 10, 2013, 11:16
#5
New Member

Kishore
Join Date: Mar 2013
Posts: 20
Rep Power: 5
Quote:
 Originally Posted by ghorrocks When you define velocity at an inlet you just specify the magnitude. But for the initial condition you specify the full velocity vector. Hence the initial conditions is w=-2.8m/s, but the inlet is as positive number.
It is very useful

Thank you so much

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