Help with Boundary Conditions
Hi,
I have problem in assigning BC for propeller simulation. I use fan BC to represent the propeller. I draw a tube isolating the fan surface. The BC is pressure inlet --> fan --> pressure outlet and the skin of the tube is symmetry. Am I using the right BC? I have Thrust vs RPM data from experiment. I can calculate the induced velocity and pressure jump using momentum theory. I set the P operating as 1 atm. I notice that the P total in inlet should be around 1 atm and at inlet the P static is 1 atm, whereas the P total is unknown. What should I put in gauge pressure column at Pressure inlet and outlet BC? Right now, I keep it 0. It gives me wrong physical characteristics. the velocity is almost uniform everywhere, while the Velocity at oulet (V advance is 0 for hover condition) should be 2x the velocity at the fan surface. I think I have made a mistake.... |
Re: Help with Boundary Conditions
1.formula to calculate P total in respective to mach number 2.operating number at inlet set to 0 when not big pressure drop 3.specify the BC at Propell in cell zone Fluid?(i am also not sure about that,cos so far i dealt not too much with propell)
|
Help with Boundary Conditions
Hi jesse,
Thank for your answer. Isn't that total pressure as M function is for compressible flow? I'm simulating incompressible flow since the velocity is very low. Have you tried similar model before? maybe you can share your experience. |
All times are GMT -4. The time now is 09:45. |