## 10.4. Multiphase Flow with Turbulence Dispersion Force

In order to reduce convergence difficulties encountered in some multiphase flow problems, the value of the expert parameter `ggi ap relaxation` is multiplied internally by 0.75. This occurs in the following situation only:

- Multiphase flow

- Nontrivial turbulence dispersion force included

- Coupled volume fraction solution algorithm.

In this situation, the default value of 1.0 is converted internally to 0.75. If you override the default with a smaller value, the new value is also multiplied internally by 0.75.

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