About the Torque(Impulse turbine)

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Hi~~ I have already open wall force post setting. And I use the follow step (finding in the forum).

psys 5 ! cylindrical co-ordinate system at centre

getw,ftot,p,absolute !stores ftot for CSET in 4th register

oper,getw,x,5,3 !stores radius in 3rd register

oper mult 2 3 6 !stores torque in 6th register

oper smul 0.001 6 6 !0.001 scalling factor

*get torque rtot 6 ! total torque

But I got a minus value. My problem is a impulse turbine just like the pelton turbine.

Besides the rotating region,it have two other tube(inlet and oulet). What kind of "cset" should I use?

Fulid all;Fulid rotating region;Shell all;Shell rotating region?

I need the rotating region torque only.

THANK YOU.