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Working on a fire simulation and I was confused about which value is more physically correct to adjust because I know adjusting reaction speed slows down or speeds up the fire simulation.

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Any help appreciated!

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A high Fuel value will bring more fuel and make higher (but also bigger and more agitated) flames. A low Reaction Speed will speed up the reaction and make higher flames as well. To make higher flames you can also try these factors:

Select the inflow object, enable Initial Velocity and choose a high value on Z:

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Or select the domain and under Gas, increase the Buoyancy Heat:

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