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March 27, 2012, 20:26 |
NASA ROTOR 67 modelling
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#1 |
Senior Member
mahdi abdollahzadeh
Join Date: Mar 2011
Location: Covilha,Portugal
Posts: 153
Rep Power: 15 |
dear all
I am trying to model the same rotor with fluent. my domain is extended enough ( i think). i have tested almost everything but i can not obtain the correct pressure ratio for the design mass flow rate. i am using standard k-w turbulance model with 1% of turbulent intensity and 0.0001 turbulant length scale. I have tested both pressre based solver and density based solver. i have tested also diffrent combinations for inlet and outlet boundary condition. for inlet mass flow inlet or pressure inlet and at outlet pressre outlet with/without targeting the massflow rate and radial equilburim activated. i will be thankful to recive your recomandations. (I can post also my case if you want to check) Regards Mahdi |
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March 27, 2012, 20:30 |
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#2 | |
Senior Member
mahdi abdollahzadeh
Join Date: Mar 2011
Location: Covilha,Portugal
Posts: 153
Rep Power: 15 |
Quote:
acctually i am working with the grid that is on stansford university website. but at the moment i have some douts about the soliution procdure (as its my first case on rotors) . i have seen that some guys are usingnot a extended geomtry in a way that inlet and outlet are placed in a position that experimental values of pressure and temperure and etc are avilable. but in my case geomtry is extended ( suppuse that it is enough). then i have just the pressure ratio and mass flow rate and temperate and pressure at inlet and some how the tempretaure at outlet. Tin=288.2 Pin=101325 Tout=345.84 P.R=1.64 Massflow=33.25 number of blade=22 at the moment the temperature is not convergaing with density based solver ( and i have the warning related to "Temperature limited" ) but with pressure based solver everything is converging the problem is that for both cases the pressure ratio is small maximum 1.5 and with mass flow is correct ( as i am using target mass flow rate) i dont know exactly but i thinck there should be sth beyond grid (in fact my spanwise Mach number distrubition is not even similar to the correct results |
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March 28, 2012, 05:50 |
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#3 |
Senior Member
mahdi abdollahzadeh
Join Date: Mar 2011
Location: Covilha,Portugal
Posts: 153
Rep Power: 15 |
with pressure based solver i was able to obtain the correct pressure ratio and massflow rate. but still the distribution of Mach number is strange spesially near the out let.
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May 2, 2014, 15:07 |
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#4 |
Member
RacMat
Join Date: Jan 2013
Posts: 78
Rep Power: 13 |
Hi,
Were you able to get this to work? I havent been successful so far, i could use some help thank! |
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