As ANSYS Staff, we can not download attachments. Please upload images using upload image functionality. Obviously coarser mesh will have different results than finer mesh. Please check theory guide for the same. You will first need to do mesh independent study. You need to have a mesh where results do not change further even if mesh is refined. Then check convergence criteria. Make sure that along with residuals, you also monitor key variables to confirm convergence. Regards,KeyurHow to access Ansys Online Help DocumentHow to show full resolution imageGuidelines on the Student CommunityHow to use Google to search within Ansys Student Communityhttps://forum.ansys.com/discussion/comment/103615#Comment_103615

My apologies. I will get the pictures uploaded properly as follows. I understand that I need to keep running it at more and more refined meshes until the values doesn't change. Usually the trend I observe with Pressure drop is that it gradually comes closer and closer to the analytical prediction with more refined meshes. However the trend here was that it started with an ANSYS pressure drop close enough to the analytical value at a coarse mesh, but kept rising dramatically until over 12 million nodes where it suddenly rebounded back close to the analytical value. I am puzzled as to what could account for such dramatic fluctuations?nn