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Need help in some problem

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Yash Raj Haldaniya 2021-10-28

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评论： Sam Chak 2021-10-30

If someone can help in a problem requiring MATLAB coding.. Please pm me

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Geoff Hayes 2021-10-28

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编辑：Geoff Hayes 2021-10-29

@Yash Raj Haldaniya - please provide some details on what kind of help you require.

Yash Raj Haldaniya 2021-10-28

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@Geoff Hayes It's a problem of finite difference method requiring a liltle bit of fluid mechanics knowledge.. if you can help me with this please reply,

Yongjian Feng 2021-10-28

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Why not just post the details here? Others can figure out if they can answer.

Yash Raj Haldaniya 2021-10-29

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The differential equation governing flow in the saturated zone for a two-layered soil under steady state equation can be represented as Kxi(d^2ⲫi/dx^2)+Kyi(d^2ⲫi/dy^2)=0 where and i=1 and 2, ⲫi is the hydraulic head of the i-th layer and Kxi and Kyi are the saturated horizontal and vertical hydraulic conductivities in the x- and y- directions, respectively. The boundary condition at the phreatic surface for a steady accretion rate N on it can be expressed as Kx1(dⲫ1/dx)^2+Ky1[(dⲫ1/dy)-{(Ky1+N)/2Ky1}]=Kyi{(-N+Ky1)/2Ky1}^2

Yash Raj Haldaniya 2021-10-29

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The above boundary condition of the phreatic surface is difficult to incorporate in a modeling sequence owing to the high level of nonlinearity associated with it.

Walter Roberson 2021-10-29

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Ok but what is the question?

Yash Raj Haldaniya 2021-10-29

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@Walter Roberson i've to solve the above equations using finite difference method and then code them in matlab

Walter Roberson 2021-10-29

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That is not a question.

"I have to paint the outside of my house. There are some complications that make it more difficult than usual."

That is a statement, not a question.

A question might be, for example, "If the wood is pine and it is on the East side of the house where it gets the morning sun, and it is common for it to get down to -30C in the winter, am I better off using a dark oil-based paint to take advantage of passive heating in the winter, or does that create too much heat differential, or would oil paint be a problem at those temperatures?"

Give us something specific to focus on. Do not just announce that you are responsible for doing something complicated: talk about what you know and about what you do not know and ask for information about particular things.

Yongjian Feng 2021-10-29

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Agree with Walter. Maybe you need to figure out (decouple) all fluid mechanics complexity first, and isolate the matlab specific difficulty. It is a matlab forum anyway, and we try to answer matlab related questions.

Sam Chak 2021-10-30

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Sometimes young researchers have trouble asking questions because they do not know how to make an approach to solving a problem.

From what Yash Raj Haldaniya described, it sounds like a boundary value problem that may be solvable using the bvp4c function. He probably has referred to the documentation but did not find relevant or sufficient examples for coding the boundary conditions, which require the bcfun function handle to compute the differential equations at a steady accretion rate N.

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