TO CHAM.HOW I SET UP AN EASY SUPERSONIC CASE?
 

TO COMPANY CHAM

I WANT TO SIMULATE SUPERSONIC FLOW, BUT I CAN'T SEE ANY RIGHT TUTORIAL (Y101 AND 105 ARE TOTALLY WRONG!) HOW I SOLVE HYPERBOLIC EQUATIONS? THANKS

Re: TO CHAM.HOW I SET UP AN EASY SUPERSONIC CASE?
 

STK, Just relax! Take it easy and try to read the PHOENICS documentation. ;-)

Re: TO CHAM.HOW I SET UP AN EASY SUPERSONIC CASE?
 

If you like supersoninc cases try 158,159,156,160,161,908 Parabolic? May be 170,171,172,176,173,174,175 (and more..) If you do not understand something, it's not reason to said bad things.

Re: TO CHAM.HOW I SET UP AN EASY SUPERSONIC CASE?
 

have you seen these cases, i insist saying bad things because for example in case 159, the inlet velocity is 2 meters pers second (and the others are not right f.e. underexpansion..)! i think is an example case and it must be represantative for that kind of flows. I checked and ground there is no code! i don't know what is happening, but i am going to learn soon! thanks for your help for the cases.

Re: TO CHAM.HOW I SET UP AN EASY SUPERSONIC CASE?
 

I HAVE THE SAME PROBLEMS!!!!!!! I DO NOT CONSIDER PHOENICS A RELIABLE CFD SUPERSONIC SOLVER, WHAT DOES CHAM SAY ABOUT IT?

Re: TO CHAM.HOW I SET UP AN EASY SUPERSONIC CASE?
 

Why? Please, say something concrete, not like "I KNOW AT LEAST 70%" and "LOUGH UNTIL TOMORROW". It's not scientific words. Please, just calculations and numbers but not "I think this picture is incorrect because I didn't see shock waves". If you will write in same style, nobody answer on your questions.

Re: TO CHAM.HOW I SET UP AN EASY SUPERSONIC CASE?
 

I DON'T KNOW TO WHOM YOU ARE POSTING, BECAUSE I DIDN'T TELL ANYTHING LIKE THOSE YOU MENTIONED. ANYWAY YOU HAVE TO KNOW IF A PROCESS LIKE A SHOCK DOESN'T APPEAR IN THE FLOWFIELD, WHEN IT HAS TO BE SHOWN, THEN THE CODE IS TOTALLY INACCURATE. I MEAN THAT SHOCK IS A VERY MAIN PHENOMENON. AND I EXPLAIN: WHEN A SUPERSONIC FLOW ENTERS IN A CONVERGING NOZZLE , BECAUSE OF THE DEFLECTION ANGLE, ARE FORMED SHOCK WAVES. THESE ARE REGIONS OF DISCONTINUITY (jump of pressure, fall of mach number e.t.c). WHEN I RUN THESE LIBRARY CASES I SAW THAT THE FLOW RESSEMBLES TO THE LAMINAR SUBSONIC FLOW, WITHOUT ANY PROCESS RELATIVE TO SUPERSONIC. ALSO SEE THE PROBLEMS ARISING IN VR-VIEWER AFTER RUNNING EARTH. THE FULL GRID DOESN'T APPEAR. THE ONLY EXAMPLE THAT IS RIGHT IS IN POLIS IN THE SECTION OF MATHEMATICAL-PHYSICAL CONTENT OF PHOENICS, WHICH IS NOT AVAILABLE IN THE LIBRARY (NOT ANY Q1 AND SET UP). THIS DOESN'T CREATE DOUBTS ABOUT HYPERBOLIC SOLVING??????????????

Re: TO CHAM.HOW I SET UP AN EASY SUPERSONIC CASE?
 

Try running library case 156; supersonic flow in a duct using the hyperbolic solver (so only a single sweep in marching direction is required for the solution). Run it via the Satellite. The results are correct; both the expansion and compression waves are of the right strength. I agree that cases Y101 and Y105, which uses the elliptic solver, are incorrect. However, I note that they use fine-grid embedding, and I would suggest eliminating the fine-grid embedding, in case that is responsible for the spurious solutions.

Re: TO CHAM.HOW I SET UP AN EASY SUPERSONIC CASE?
 

I DON'T KNOW TO WHOM YOU ARE POSTING, BECAUSE I DIDN'T TELL ANYTHING LIKE THOSE YOU MENTIONED. ANYWAY YOU HAVE TO KNOW IF A PROCESS LIKE A SHOCK DOESN'T APPEAR IN THE FLOWFIELD, WHEN IT HAS TO BE SHOWN, THEN THE CODE IS TOTALLY INACCURATE. I MEAN THAT SHOCK IS A VERY MAIN PHENOMENON. AND I EXPLAIN: WHEN A SUPERSONIC FLOW ENTERS IN A CONVERGING. NOZZLE , BECAUSE OF THE DEFLECTION ANGLE, ARE FORMED SHOCK WAVES. THESE ARE REGIONS OF DISCONTINUITY (jump of pressure, fall of mach number e.t.c). WHEN I RUN. THESE LIBRARY CASES I SAW THAT THE FLOW. RESSEMBLES TO THE LAMINAR SUBSONIC FLOW, WITHOUT ANY PROCESS RELATIVE TO SUPERSONIC. ALSO SEE THE PROBLEMS ARISING HTTP://WWW.HANDYMATE.CO.UK IN VR-VIEWER AFTER RUNNING EARTH. THE FULL GRID DOESN'T APPEAR. THE ONLY EXAMPLE THAT IS RIGHT IS IN POLIS IN THE SECTION OF MATHEMATICAL-PHYSICAL CONTENT OF PHOENICS, WHICH IS NOT AVAILABLE IN THE LIBRARY (NOT ANY Q1 AND SET UP). THIS DOESN'T CREATE DOUBTS ABOUT HYPERBOLIC SOLVING??????????????

Re: TO CHAM.HOW I SET UP AN EASY SUPERSONIC CASE?
 

Hi Supersonic User - I would like to play around with supersonic flows. I have been playing a LOT with VR-case 808 (flow around a circular cylinder). Can you suggest what changes I would make to get accurate results of a supersonic flow, i.e., what models do I invoke? Air-isentropic flow (versions 1 or 2)? What turbulence model? Is there some other model or solver that that needs to be set to correctly handle MACHno > 1?

THANKS!!! PattiMichelle