{"id":365707,"date":"2024-05-06T17:37:06","date_gmt":"2024-05-06T17:37:06","guid":{"rendered":"\/forum\/?post_type=topic&p=365707"},"modified":"2024-05-06T17:37:06","modified_gmt":"2024-05-06T17:37:06","slug":"natural-convection-convergence-issues","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/natural-convection-convergence-issues\/","title":{"rendered":"Natural convection convergence issues"},"content":{"rendered":"

Hi all,<\/p>\n

I am having issues with my Fluent simulation, in which I am modelling a solar chimney.<\/p>\n

I am aiming to obtain the steady state value for the mass flow rate at the outlet. The illustration below pictures my simulation setup. I have 3 domains, the outlet_right, indoor, and outlet_left. The outlets are set up to be at ambient conditions. I have set two outlets in order to be able to set the gauge pressure at both instead of the total gauge pressure at the inlet. I am currently experimenting with 3 small holes as inlets to the room, but I have also tried with one bigger one and obtained similar results. <\/p>\n

I am expecting buoyant flow due to the heat flux applied on the walls. Unfortunately, the residuals remain high and the mass flow rate reaches 5kg\/s (around 100 times higher than expected). As also visible in the contour, velocities reach 59m\/s which are unrealistic and high.<\/p>\n

I think that the issue might lie within the boundary conditions. However, I have set them according to the Ansys Fluent guide (pictured in screenshot).<\/p>\n

Could anyone kindly take a look at this and advise me on what might be going wrong?<\/p>\n

Thank you.<\/p>\n

\"\"\"\"<\/p>\n

 <\/p>\n","protected":false},"template":"","class_list":["post-365707","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t