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calculus and analysis - Residue failed to reproduce this residue in a paper


This problem is a more clearly state of my original problem which is off topic, so I reconsider my problem carefully based on previous discussions, and gives the following valid code to reproduce my problem with all the necessary information.


I use Mathematica to confirm a result from a paper Unsteady unidirectional flow of Bingham fluid between parallel plates with different given volume flow rate conditions which is to calculate the residue of a expression at zero.



  1. Reproduce of my problem:



The following code shows my efforts, but failed to reproduce the analytical solution (resAna in the code) in the papaer.


ClearAll["Global`*"]

varCons = {ν > 0, up > 0, h > h0 >= 0, h > y >= 0};
m = Sqrt[s]/Sqrt[ν];
Δ = Sinh[m h] Sinh[m h0] - Cosh[m h] Cosh[m h0];
Ξ = Cosh[m h0] (Sinh[m h] - Sinh[m h0]) - Sinh[m h0] (Cosh[m h] - Cosh[m h0]);
Ω = (m h (Δ + Cosh[m h0] Cosh[m y] - Sinh[m h0] Sinh[m y]))/(m h Δ +
m h0 (Cosh[m h0]^2 - Sinh[m h0]^2) + Ξ);

u = FullSimplify[up/(t0 s^2) Ω E^(s t), varCons];

Residue[u, {s, 0}]
(* this failed gives the desired 'resAna' as below *)

X1 = (1/6 (h^3 - y^3) h0 + 1/6 (h - y) h0^3 - 1/4 (h^2 - y^2) h0^2 -1/24 (h^4 - y^4)) (1/ν)^(5/2);
X2 = ((h - y) h0 - 1/2 (h^2 - y^2)) t (1/ν)^(3/2);
X3 = (h^5/30 - (h^4 h0)/8 + (h^3 h0^2)/6 - (h^2 h0^3)/4 + (21 h0^5)/120) (1/2 (h^2 - y^2) - (h - y) h0)/(h0^3/6 - (h0 h^2)/2 + h^3/3) (1/ν)^(5/2);
resAna = -((up h)/t0) (X1 + X2 + X3)/((h0^3/6 - (h0 h^2)/2 + h^3/3) (1/ν)^(3/2));
(* resAna is the analytical solution in the paper *)


enter image description here 2. Some numerical tries to get a clue or two


NResidue seems works after given a set of numeric values, but Residue still doesn't work


t0 = 1/10;
t = 2 t0;
up = 1/100;
ν = 2/3580;
h = 1/1000;
h0 = h/8;
y = h/9;


Needs["NumericalCalculus`"]
NResidue[u, {s, 0}, WorkingPrecision -> 20, PrecisionGoal -> 20] // Chop

N[resAna, 20]

Residue[u, {s, 0}]

enter image description here 3. I had thought that Residue should work as in this example by @xzczd


ClearAll["Global`*"]

r = 1;
f[p_, ξ_] = -(5 p Sqrt[(5 p^2)/6 + ξ^2])/(4 (-4 ξ^2 Sqrt[(5 p^2)/6 + ξ^2] Sqrt[(5 p^2)/2 + ξ^2] + ((5 p^2)/2 + 2 ξ^2)^2));
poles = p /. Simplify[Solve[Denominator[f[p, ξ]] == 0, p], ξ > 0]
Residue[f[p, ξ], {p, #}] & /@ poles;
Simplify[%, ξ > 0] // N

Answer




I. A summary for the failing trial






  1. Residue can't calculate the residue of u directly. (It's hard to tell whether it's a bug or not, Residue never promises he will calculate every known residue, anyway.)




  2. SeriesCoefficient won't give desired answer in the following case:


    SeriesCoefficient[u, {s, 0, -1}]

    enter image description here


    If it gave the desired answer, we would be able to calculate the residue by finding Laurent series expansions.





  3. Limit won't give desired answer in the following case:


    Limit[D[s^2 u, s], s -> 0]

    If it gave the desired answer, we would be able to calculate the residue with limit formula.





II. Solution




By observing the structure of undesired output of SeriesCoefficient and u


enter image description here


I guess that maybe it's the $\sqrt{\nu}$ term that causes trouble, so I tried adding the known constraint $\nu>0$ to SeriesCoefficient and Limit, and they give the desired answer then:


resAnaTrue = 
Simplify[SeriesCoefficient[u, {s, 0, -1}, Assumptions -> ν > 0], ν > 0];

resAnaTrue2 = Limit[D[s^2 u, s], s -> 0, Assumptions -> ν > 0]
(* -(h up (h - y) (h - 2 h0 + y) (2 h^3 - 6 h^2 h0 -
2 h (2 h0^2 - 10 h0 y + 5 y^2 + 60 t ν) -
h0 (7 h0^2 - 10 h0 y + 5 y^2 + 60 t ν)))/(20 (h - h0)^2 (2 h + h0)^2 t0 ν) *)


resAnaTrue == resAnaTrue2 // Simplify
(* True *)


III. The formula given in the paper is incorrect



Let's first check the result with the parameters given by you:


para = {t0 -> 1/10, t -> 2 t0, up -> 1/100, ν -> 2/3580, h -> 1/1000, h0 -> h/8, y -> h/9};
ref = NResidue[u //. para, {s, 0}, WorkingPrecision -> 64];

rst1 = N[resAna //. para, 64];
rst2 = N[resAnaTrue //. para, 64];
ref - rst1
(* -2.9855303465924184799970408331399786805478493918575833694822*10^-7 *)
ref - rst2
(* 0.*10^-66 *)

As one can see, the precision of the new derived formula is desired, while there's a significant difference (approximately 3*10^-7) between the formula given in the paper and numeric result.


With the following set of parameter, the difference will be even clearer:


para2 = {ν -> 1/2, h0 -> 1, h -> 3, t0 -> 1/5, up -> 1/5, y -> 1/3, t -> 5};

ref = NResidue[u /. para2, {s, 0}];
rst1 = N[resAna /. para2];
rst2 = N[resAnaTrue /. para2];
ref - rst1
(* -0.653061 + 1.22133*10^-13 I *)
ref - rst2
(* 9.76996*10^-15 + 1.22133*10^-13 I *)

Apparently the formula in the paper is wrong.


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