hello everyone.
i'm working on a fluid flow into a wavy channel and i wrote a time-varying equation code of pressure for inlet boundary condition of pressure in openfoam and set the "pressureInletOutletVelocity" for inlet of velocity to determine the velocity based on pressure.
the code i have written for inlet of pressure is:
P=p0+Acos(wt)
and naturally it fluctuates at the inlet over the time.
when i set a boundary condition for inlet of velocity to determine it based on pressure ,naturally the velocity have to fluctuate based on pressure fluctuations.
and in low mesh number (30000) the velocity fluctuates based on pressure but in high mesh number it doesn't.
i want you to know the velocity decreases in high mesh number compared to low mesh number.
now, i don't know if it doesn't fluctuate because of the reduced velocity or something else,i increase the initial pressure for having high velocity value but it doesn't work.
anyway the velocity doesn't fluctuate in high mesh number.
if anyone has experience in this matter, i would appreciate it if you could help me.
Without the full details of your flow problem and numerical method is not possible to answer.
There is no need to explain more information.
It fluctuates in low mesh number ,this mean every things is ok.
But in high mesh number doesn't .
This mean a thing is wrong with high mesh number.
What can be wrong when the mesh number is high?