problem with analysing pressure in suction cup(weird pressure)

mitchell32 · March 7, 2019, 13:25

Hey guys,

I'm currently analyzing a pressure distribution in a suction cup with ANSYS CFD but here is the problem. The inlet pressure is 100kPa and the outlet pressure is 70kPa but the simulation is saying that the pressure inside the cup will be like something GPa and I just can't find out what I have done wrong.
here are the result and the report. can you maybe help me with finding the problem? setting is in the pic and mesh was done by automatic mesh

12.PNG

13.PNG

21.PNG

ghorrocks · March 7, 2019, 17:19

Your simulation is diverging. If you have not got an overflow error yet, you soon will. Here is the FAQ on overflow errors: https://www.cfd-online.com/Wiki/Ansy...do_about_it.3F

Mesh quality is going to be a big contributor here. Also you probably will need a compressible flow model.

evcelica · March 7, 2019, 17:24

Your mesh is most likely garbage.
Where is your inlet at?

March 7, 2019, 13:25	problem with analysing pressure in suction cup(weird pressure)	#1
mitchell32 New Member HK Join Date: Mar 2019 Posts: 1 Rep Power: 0	Hey guys, I'm currently analyzing a pressure distribution in a suction cup with ANSYS CFD but here is the problem. The inlet pressure is 100kPa and the outlet pressure is 70kPa but the simulation is saying that the pressure inside the cup will be like something GPa and I just can't find out what I have done wrong. here are the result and the report. can you maybe help me with finding the problem? setting is in the pic and mesh was done by automatic mesh 12.PNG 13.PNG 21.PNG

March 7, 2019, 17:19		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,872 Rep Power: 144	Your simulation is diverging. If you have not got an overflow error yet, you soon will. Here is the FAQ on overflow errors: https://www.cfd-online.com/Wiki/Ansy...do_about_it.3F Mesh quality is going to be a big contributor here. Also you probably will need a compressible flow model. __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

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March 7, 2019, 17:24		#3
evcelica Senior Member Erik Join Date: Feb 2011 Location: Earth (Land portion) Posts: 1,188 Rep Power: 23	Your mesh is most likely garbage. Where is your inlet at?