code_saturne User's Forum

Yes, as mentioned above you have some named selections problems, please check that your selection criteria corresponds to mesh named selections. I just want to point out that you also have no faces in your interface BC . Boundary zone "interface" id = 8 Number of faces = 0 Surface = 0 If y...

Sorry, cannot help you with this particular error (looks like something's wrong in default Saturne settings with 2D mesh). But, as a workaround, you can use 3D "flat" case, just slice your geometry and create 3D mesh. Common way (not in this situation) to solve divergence problems is: 1. U...

Hello. Because my experiments with kinetics in built-in gas combustion model was not successful, I introduced my own standard model that is usually called " Finite Rate Chemistry/Eddy Dissipation ". I made it for the company so I cannot share sources here, sorry, but I describe main featur...

Hello, jgd23 Regarding convergence control. We usually don't look at standard residual monitors because they say nothing practical too often. Instead of this, we control: 1. Monitors of averages, minimum and maximum at characteristic points, sections or volumes. It's easily done in Fluent or CFX, bu...

Thanks! I found required functions in cs_parall.h . Actually, I needed summary heat of reaction so cs_parall_sum made the trick. There are also other helpful functions in that header. Kind of magic is that functions take only current thread variable and collect data from all other threads automatica...

Hello. I have a question that is simple for you but tricky for me. In user-functions, I usually work on current process, so every process launches it's copy of the same user function. But now I need to calculate some statistics and print it to log (for simple hand-made CH4 combustion model). I check...

Hello. I experimented with yf ( ifmp ) setting depending on temperature to make the model sensitive to ignition temperature. I created base results with original model so temperatures was high enough for ignition. Then I introduced the following simple thing in pdflwc.f90 around line 214: ! ORIGINAL...

Hello. For heat transfer calculations I usually choose SST model, mesh inflation with Y+ = 1...5 is needed. K-epsilon with high Y+ (up to 300...500) may be used if: 1. You are not interested in separation and reattachment (for example, it's not suitable for tube bundles direct simulation). 2. You su...

Thanks for the info! So nostalgic to hear that the model is decades old... The world was different that times. Although flamelet/PDF models are used by others, we cannot use diffusion-only models because we are interested in boiler burner simulations where ignition never takes place until hot gases ...

I tried to introduce kinetic dependence into Saturne 7.0.2 model but without any positive results. As I understand, from three gas combustion models available, only Libby-Williams one deals with kinetics, but it does not work correctly. I investigated the code in extent I can and found the following...