Superficial Velocity Porous Formulation
 

Hello,

I simulate the flow around a vane with pressure based solver, k-e-model, energy on and pressure in/outlet bcs

The picture shows the distribution of the total temperature but the red spot is definetely wrong. Instead you should be able to see the trail of the trailing edge. This red temperature is even higher than my defined backflow temperature. there was some reversed flow in the beginning of the simulation but that went away. I checked bcs, adjusted under-relaxiation factors and continued simulating until next convergence but the temperature did not behave as wished...

then I stumbled over the superficial velocity porous formulation and I cannot judge if this default setting might cause this temperature anomaly... can anyone explain, if this formulation could influence the temperature distribution? I read the user guide concerning the SVPF but that did not help much

also, I am thankful for any other suggestions that might help fixing this

This is only used for porous zones. Do you porous zone?

List you numerical and BC details Please

Check the convergence or post the residual plot and flow imbalance report

no I don't use porous zone. But even without using it, a superficial velocity is applied by default by fluent. The influence of this setting is unknown to me...

bcs: periodic (top/bottom), pressure in-and outlet, stationary wall

no rotating system, 1 cell zone,

using pressure-based solver
methods: green-gauss-cell-based, standard pressure, rest first order then changing to second order (see the spike in the residuals)

carry on calculating and use local scaling for monitoring the residuals. Watch the imbalances and use PRESTO! for the pressure interpolation and the coupled solver in second stage

I disabled the absolute convergence criteria in the residuals settings window and carried on iterating which made the irregularities go away