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-   -   Difference between pressure, absolute pressure and Total Pressure (http://www.cfd-online.com/Forums/cfx/106715-difference-between-pressure-absolute-pressure-total-pressure.html)

shaswat September 6, 2012 04:54

Difference between pressure, absolute pressure and Total Pressure
 
Dear friends

I have a very basic questions which I cannot come to the conclusion

what is the difference between absolute pressure, Pressure and Total pressure.

When shall I measure pressure and when shall i measure Total pressure ?

Let's say a sensor is placed in the middle of the flow, what shall i use to specify pressure ( pressure or total pressure or absolute pressure)

Regards

Govind

ghorrocks September 6, 2012 06:12

In CFX these variables are defined as:

* Absolute pressure is the.... absolute static pressure
* Pressure is the static pressure above the reference pressure
* Total pressure is the pressure plus the dynamic head.

For what these terms mean and what sensors would read have a look in any fluid mechanics textbook. That is really basic stuff.


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