There is a dialog box where you can change “viscosity” interactively. Bring it up through SARndbox’s main menu (right mouse button). For scripting, you can send commands, including changing water simulation parameters, through SARndbox’s command pipe. See this post; the “viscosity” setting is water attenuation. The default attenuation is 0.078125, for lava you can use something like 0.9.
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