Good morning everyone,
Being a beginner in the use of the flow simulation module of Solidworks (basically the CFD module of SW) and after having done the tutorials that I think are the most important for my project, I set about my project which consists of seeing the temperature evolution of electronic equipment with a thermal diffusion power of 1kW each in a heat transfer liquid bath (and also to see , liquid temperature). So I make my 3D models, in the most minimalist way possible in order to reduce the number of cells on which the simulation works.
After several open-loop tests where I set boundary conditions such as volume flow at the input and pressure at the outlet, I decided to be a little more realistic and after several videos on the subject I decided to set up a closed loop system with internal fans that play the role of pumps (and also to struggle with the SolidWorks routing module, we're not a problem anyway). Here the problems come because I also discover the joys of also doing simulation in a transient regime (flow simulation by default doing simulations that stop once the defined objective reaches a certain criterion so we can say that it is permanent for a characteristic) and naïve that I am, I decide to put a simulation of one hour/3600s and I am surprised that the calculation time takes me several days and that the evolution of my parameters in transient are not the same as in steady state (after all, in view of the project, the simulation in transient is much more logical).
So here I am with a lot of questions, first of all, why do I end up with such long simulations when I have about 100k cells (I still aim to reduce the number of cells by optimizing the mesh on the volumes on which I look for the characteristics the most)? Secondly, I often have warning messages about the operating ranges of my pumps, could this greatly affect the fluid and the evolution of the temperature (knowing that by doing my theoretical calculations, I end up with a heat exchange of the natural convection type greater than my forced convection (despite my pumps))? Finally, is there a way to know how to validate my simulation with a theoretical study (I managed to find the technical reference documents of flow simulation 2020, but I can't find the information I want for the evolution of the temperature in convection)?
Attached is the solidworks assembly, as well as the steady-state (Objective Curve 11) and Transient (Objective Curve 13) objective curves.
Thank you in advance for all the help I gave (and I hope I didn't digress too much on the subject and didn't murder you with my cobblestones).
projetimmersion.zip