Fluctuating residuals
 

Dear collegues

I am new to fluent. I have modeled a room 8m length by 4m. The room has 2 windows and 1 door on windward side and 2 windows and 1 door on leeward. I have also modeled the atmospheric air as an enclosure of the room. The atmospheric air enclosure measures 252m (width) by 256m (length) by 105m (height). I am using polyhedra mesh. I am running steady flow simulation. The energy equation is off. The solution has converged after 77 iterations. I am having fluctuating residuals and the continuity and epslon residuals are fluctuating above 10e-3. The others are fluctuating below. What causes these fluctuations and how can I solve the problem. May you please assist with regard to the above.

Thank you in advance for any contributions.

Hi,

What do you mean by "fluctuating residuals?" Are they just oscilating around a single value that is greater than 10^-3? That's normal, you might just need to relax the solution a little bit (take smaller guessing steps).

What is your criteria for convergence?