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Underelaxation factor density - convergence problem

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Old   February 13, 2022, 13:18
Unhappy Underelaxation factor density - convergence problem
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Karla Jacinto
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Hi,

I'm trying to solve a high turbulent two-phase flow by using UDF to read the fluid properties.

I'm having problems converging the solution once the continuity residual gets flat, with some oscillations around the value of 1e-1. In that case, the solution is very unstable, changing completely between iterations.

If I increase the under-relaxation factor for Density the residual keeps growing until it reaches floating point error.

I tried to converge only on the flow equations, but the problem persists.

For the initialization, I used the real gas solution (that converged).

Please, if you have any strategy for me, I will be grateful. Ah, I'm using pressure-based and the scheme is couple.
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