Chinedu Nwaigwe

15 Questions 35 Answers 0 Followers

Questions related from Chinedu Nwaigwe

Can I implement a 2D finite difference scheme in deal ii?

I have a 2D finite difference scheme to implement. I use C++ but do not want to write my own 2D grid as I would like to reuse the code for many other problems. Hence, I want to use a...

30 June 2020 6,753 0 View

What is the most efficient way of computing the inverse of a very large sparse matrix?

I need to multiply the inverse of a matrix A to another matrix B. If B were to be a vector, I would simply solve a linear system Ax = B to get the product x=inv(A)B. With B being a matrix, I...

30 April 2020 10,104 12 View

Are compact finite difference schemes (in which one first solves a linear system for every derivative appearing in the equation) truly compact?

Take for instance, a stencil of 3 points can be used for 2nd order approximation of second derivative. Ordinarily, one would need a larger stencil for higher accuracy of the same derivative...

24 April 2020 2,676 0 View

Does anyone have the English version of the de Saint Venant paper in which he derived the channel model?

I need the English version of this paper which was publish in 1871.

28 August 2015 5,635 2 View

Does anyone know of any freely available tool (pre- and post-processor) that can be linked to a C++ solver?

I need a well developed pre- and post-processor that can generate complex meshes and provide all the functionalities needed to solve flow problems in it. And also allow visualizations. The goal is...

12 February 2015 2,797 15 View

Does anyone have experience in modeling strategy of relaxation?

Given a PDE model with some constraints restricting the range of values of model quantities, how does one apply the idea of relaxation to such a model? Any idea or references on relaxation idea of...

23 September 2014 1,424 11 View

What condition(s) hold on fluid particles across a line or surface inside a fluid domain?

Consider a 1-D flow along x-axis with z-axis in vertical direction. The fluid domain is bounded below by a fixed bottom at z=b(x) and above by free-surface at z = h(x,t)+b(x), with h= height of...

17 August 2014 7,170 5 View

Could anyone help to point out the major differences between github and bitbucket?

I already understand that one needs to pay for every private repository in github but one can get unlimited private repos in bitbucket. This is particularly making a lot of people, especially...

21 April 2014 5,284 5 View

I really want to understand if there is any reason why one should not inherit from the stl vector class in c++?

What then, is the best practice in overloading operators on members of the stl vector class? In particular, which of these three choices do you think is best? i) to use operator overload to...

19 February 2014 9,518 22 View

New Approximate Riemann Solvers

Hi all, could anyone tell me if there is any recently developed Riemann solver for hyperbolic conservation laws? I'm aware of the methods of Roe, Rosanov,kinetic, HLL,HLLC, Osher-Solomon, and in...

03 February 2014 4,705 1 View

What do you think about pre balanced SWEs?

It has been stated that the pre-balanced formulation of the Shallow water models is advantageous in terms of well balancing. But another argument is that the pre-balanced formulation is not in...

07 September 2013 6,584 3 View

Looking for reference regarding DG Implementation

I'm implementing the Discontinuous Galerkin Finite element method for the SWEs. Kindly suggest some useful reference materials.

06 August 2013 9,544 3 View

Can someone help me regarding finite volume implementation of Shallow water equation?

I have just started studying the shallow water equations. I have solved and implemented the Riemann Problem for the 1-D case. I now want to implement a finite volume scheme for the same 1-D SWEs...

12 May 2013 5,475 5 View

How does one implement wetting and drying? Is it just by ensuring positive height or by incorporating some terms in the model equations?

I am learning to develop algorithm for flooding and drying. And am using the 2D shallow water model.

08 March 2013 5,575 3 View

Open Source Python Code for Integral Equations

I need a collaborator with experience in code development and, if possible, numerical analysis too. I am currently developing an open source code in python that can be used to solve different...

01 January 1970 2,861 2 View