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 May 31, 2009, 04:15 please help me with pollution calculation problem. thanks #1 New Member   Ayoade Join Date: May 2009 Posts: 2 Rep Power: 0 In an infinite one-dimensional canal of cross-section A, a continous point pollution source is initiated with a volumetric flowrate, Q(m3/s) and concentration C* (mg/l). It is desired to compute the the concentration, C(x,t). (a) use and explicit scheme with a forward-time difference and a fully cntred, 2nd-space difference, and sketch the numerical operator. (b) compute a solute concentration over six distance steps and 12 time steps using only right hand part of the channel(i.e., assumed symmetry about centreline). select ^t for the best accuracy. (c) plot the result on the graph paper. Data: A=200 m2 C*=1000mg/l ^x=250m K=100 m2/s Q= 1 m3/s C(x,0)=0(initially) Hints: 1. assume the point source as a concentration diluted over ^t and uniformly mixed over the channel volume. [C/^t]=[C*Q/A^x]. 2. neglect the river velocity, U. boundaries: take for boundary conditions 1. pollution source(j=1), symmetry. set C0=C2 2. at far right boundary, take C=0 for all n.

 May 31, 2009, 04:19 #2 New Member   Ayoade Join Date: May 2009 Posts: 2 Rep Power: 0 please help me with this question. thanks

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