[Deep111090]

Hi All,
This may sound a bit naive but i have been stuck upon this question for few days.
I am solving a 2D lid driven flow using SIMPLE algorithm. Till now, I have a working code which give accurate results with respect to benchmark values.
But as i am experimenting with this. i decided to feed a known pressure field into the the discretized momentum equations to solve for the velocity field. (omitting the solution of Poisson equations for pressure). However, starting from random velocity fields with known boundary conditions, I am only able to achieve convergence up-to Reynolds number of 100 and beyond that the solution does not converge and gives inaccurate velocity fields even if i feed correct pressure field.



I tried same thing in openFOAM by modifying the solver to omit the pressure calculation step and feed the correct pressure field as initial condition. The result remains the same, the solution converges upto 100 Reynolds number beyond that the solution does not converge.
I was wondering what can be the reason behind this.

Thanks in advance.
PS: if my question is not clear please feel free to ask for more details.