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How can I get the field-value at previous two time-steps

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Old   April 1, 2015, 19:13
Default How can I get the field-value at previous two time-steps
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lqiao19
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Hi, formers!

I want to predict the value of a scalar-field at the runTime using its at the previous two time-steps. In a mathematical expression, it can be expressed like F(n+1)=2*F(n)-F(n-1).
In openFOAM, I know that creatField can read and write the values in the running. So, the previous two time-steps maybe can read by IOobject from time-named folder. But, I don't want to write the field at all steps.
Are there some skills to realize this but no writing in every step?

Thanks for your attention!

Best wishes for you!
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