What is the total variation of a flow variable (Φ) at a particular ti – McqOptions

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1.	What is the total variation of a flow variable (Φ) at a particular time step t?
A.	TVt=∏iΦi+1-Φi
B.	TVt=∫n Φndn
C.	TVt=∑iΦ(i+1)Φi
D.	TVt=∑iΦ(i+1)Φi
Answer» E.

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What is the total variation of a flow variable (Φ) at a particular time step t?