1) Make a 400x400 document. Now press "D" on your keyboard to reset the foreground and background colors to black and white. Make sure your background is WHITE.
2) Apply Filter>Render>Clouds. Then apply Filter>Distort>Polar Coordinates:
3) Now go to Image>Adjustments>Invert. Then add Image>Adjustments>Levels:
4) Now add your colors CNTRL+U:
 Duplicate the layer. Now set the blending mode to Color Dodge:
There ya go, heres my final raging flame effect:
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