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problem with grid transformation

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Old   January 22, 2014, 05:09
Default problem with grid transformation
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Hi. I'm trying to convert physical plane to computational plane and I have a bad feeling about the formula for grid transformation.
the formulation for boundary is y=a\times cos(b\times x)+c
and formula for grid transformation :
\eta =ln(x+1)
\xi =\frac{ln(y+1)}{a\times cos(b\times x)+c}

What is wrong with them?!
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