[ajinsan]

Hello,

i'm studying mechanical & process engineering in germany.
I am working on my bachelor thesis for about 6 weeks now. In my university there was no stuff like simulation softwares , so everything about cfx was absolutely new to me.


In these past 6 weeks i learned a lot about cfx and its theoretical backgrounds. This forum was a great help, and i’m very grateful for this community.


Now i am reaching a point, where i cant finish my works without somebodys helps. So I try this way, maybe someone here could support me.
First I need a confirmation for my works, wheter it is right or wrong. Secondly i would like to provide some questions about things which arent comprehensible for me.


1.)
The attached picture shows the fluid model i have designed in design modeler using the enclosure function. I have seprated the model into two stationary and one rotating domain.
The impeller doesnt exist as solid. While the rotating domain is set up with a angular velocity, the „Wall_rotating_frame“ is setting to „Counter Wall“.
Following BCs are adjust in this simulation:


Inlet :
massflow; turbulence option zero gradient

Outlet:
Opening ; opening pressure and dirn 0 Pa; turbulence option zero gradient

GGI Interfaces @ contact areas:
general connection; frozen rotor; pitch change automatic


It is a single phase, steady state simulation with a reference pressure of 0 atm using shear stress transport (as i read its the best option).
The massflow and the angular velocity oft the impeller are known values, which i gather from a experimental test. Also the pressure drop is known.



I want to know the following results:
- The force in fluid direction which affects the impeller
- The torque at the impeller


Does this work?????

2.) In post processor the streamline rotates in the wrong direction althoug i define a positive angular velocity, so i must set up a negative value.
Thereafter everythings working fine and the streamline goes into the right direction with an apparently realistic course.



Just dont get it, doesnt the rotation be subject to the right hand rule???


Im sorry for grammatical and spelling mistakes.
Hope sbdy can help me. I still have two months to finish my thesis.




http://img811.imageshack.us/img811/8636/fluidmodel.jpg

ajinsan