# convergent_divergentnozzle

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 March 21, 2009, 05:23 convergent_divergentnozzle #1 Member   sivaramakrishnaiah Join Date: Mar 2009 Location: india,pondicherry Posts: 76 Rep Power: 10 Sponsored Links i am also simulating convergent and divergent nozzle, 1) In CFX-11,Two region of flows how should analysis actually,take convergent and divergent nozzle (in convergent is subsonic and divergent is supersonic) 1)subsonic 2)supersonic in two region in single model (that means convergent and divergent nozzle in a single geometry in that in that i will give boundary condition inlet of convergent pressure 15 bar steam, throat of pressure 8 bar outlet of 1 bar pressure) i know inlet velocity of steam 856 m/s this is saturation steam. How will analysis in CFX-11,as a hypercritical point of correct results came,but i should verified in CFX-11 SOFTWARE analysis,please let me know. once again thankyou for replay. ,i am sending .rar file,please verify it, in that CFX,and ICEM files. Actually i done same process,but solution not converging Geometry:combined of convergent and divergent nozzle. Converging and diverging nozzle flow problem My doubt,this model i was created in UNIGRAPHICS modeling software,meshing ICEM CFD, when ever i am giving analysis:at that time some problem is there step2:Boundary condition Fluid :Steam mass flow rate:0.5 kg/s at inlet of convergent nozzle:subsonic condition a)pressure=10 bar;Temperature:356 m/s at outlet of Divergent nozzle :a)supersonic condition . You told this type of settings and simulations given by tutorial 8 from ANSYS CFX release 11.0. in this different : inlet is supersonic condition outlet also supersonic condition but my point of view inlet is subsonic and outlet is supersonic condition 1)i was increased mesh size 2)That flow direction changed 3)Fluidry steam taken 4)Same boundary conditions But does not converging(up to 200 iterations converging),what i am thinking know up to convergent portions was converged.after that it is not converging,) convergent nozzle:solution converging . Divergent nozzle:solution not converging as per velocity plot.and pressure plot. Actually pressure should drop and velocity should increases.but in this condition; 1)convergent to throat :velocity increases and pressure droping 2)Throat to Divergent nozzle:Velocity not increasing and pressure not droping. What is the problem. i am thinking Two solutions(means subsonic and supersonic condition will not give in single solution) that is correct or not,please verify that. Thank you very much. __________________ sivaramakrihnaiah __________________ sivaramakrihnaiah