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Consider the variable ject to Dirichlet boundary conditions at x = 0 and x = 1, Show that if we s...
solve problem #1 depending on the given information Consider the following 1D second order elliptic equation with Dirichlet boundary conditions du(x) (c(x)du ) = f(x) (a $15 b), u(a) = ga, u(b) = gb...
solve problem #1 depending on the given information
Consider the following 1D second order elliptic equation with Dirichlet boundary conditions du(x) (c(x)du ) = f(x) (a $15 b), u(a) = ga, u(b) = gb dr: where u(x) is the unknown function, ga and gb are the Dirichlet boundary values, c(x) is a given coefficient function and f(x) is a given source function. See the theorem 10.1 in the textbook for the existence and uniqueness of the solution. 1.1 Weak Formulation...
Consider a potential problem in the half-space defined by 2 20, with Dirichlet boundary conditions on...
Consider a potential problem in the half-space defined by 2 20, with Dirichlet boundary conditions on the plane z = 0 and at infinity). (a) Write down the appropriate Green function G(x, x'). (b) If the potential on the plane z = 0 is specified to be 0 Vinside a circle of radius a centered at the origin, and Ø = 0 outside that circle, find an integral expression for the potential at the point P specified in terms of...
2. Show that the Dirichlet problem for the disc t(z,y): +y S R2), where f(0) is the boundary func...
use the hint please
2. Show that the Dirichlet problem for the disc t(z,y): +y S R2), where f(0) is the boundary function, has the solution 0o aj COS 1 sin j 3-1 where a, and b, are the Fourier coefficients of f. Show also that the Poisson integral formula for this more general disc setting is R22 (Hint: Do not solve this problem from first principles. Rather, do a change of variables to reduce this new problem to the...
3. Consider the following problem for 0 < x < 1 uzz = f(x) with inhomogeneous boundary conditions...
3. Consider the following problem for 0 < x < 1 uzz = f(x) with inhomogeneous boundary conditions u(0) 1, u( 2 (a) Find a Green's function G(x, zo) for this problem, and write down the solution u(z) in terms of G(x, zo) and (x) (b) Solve the problem directly (by integration) in the case when f(x). Show that this gives the same answer as in part (a).
3. Consider the following problem for 0
2. In lectures we solved the heat PDE in 1 +1 dimensions with constant-temperature boundary conditions u(0,t)u(L,t) -0. If these boundary conditions change from zero temperature, we need to do a litt...
2. In lectures we solved the heat PDE in 1 +1 dimensions with constant-temperature boundary conditions u(0,t)u(L,t) -0. If these boundary conditions change from zero temperature, we need to do a little bit more work. Consider the following initial/boundary-value problem (IBVP) 2 (PDE) (BCs) (IC) u(0,t) = a, u(x,00, u(L, t)=b, st. and let's take L = 1, a = 1, b = 2 throughout for simplicity. Solve this problem using the following tricks b and A"(x)-0 (a) Find a...
3. In class we discussed the heat conduction problem with the boundary conditions a(0, t) 0, t4(1...
3. In class we discussed the heat conduction problem with the boundary conditions a(0, t) 0, t4(1,t)-0, t > 0 and the initial condition u(r,0) f(a) We found the solution to be of the form where (2n-1)n 1,2,3,. TL 20 Now consider the heat conduction problem with the boundary conditions u(0, t) 1,u(T, t)0, t>0 and the initial condition ur,0) 0. Find u(r,t). Hint: First you must find the steady state.
3. In class we discussed the heat conduction problem...
(1 point) Suppose we have ut = aʻuzz, 0 < x <1,t > 0, boundary conditions...
(1 point) Suppose we have ut = aʻuzz, 0 < x <1,t > 0, boundary conditions are u(0,t) = u(1,t) = 0, and the initial condition is u(x,0) = sin(T2). What will be the behavior of u(x, t) as time increases. There may be more than one correct answer. You do not need to solve the equation to answer this question. A. The solution behaves unpredictably. B. The solution increases to infinity. OC. For a fixed t, the solution will...
1. (10 points, part I) Consider the following initial boundary value problem lU (la) (1b) (1c) 0L, t> 0 3 cos ( a(x, 0) (a) Classify the partial differential equation (1a) (b) What do the equation...
1. (10 points, part I) Consider the following initial boundary value problem lU (la) (1b) (1c) 0L, t> 0 3 cos ( a(x, 0) (a) Classify the partial differential equation (1a) (b) What do the equations (la)-(1c) model? (Hint: Give an interpretation for the PDE, boundary conditions and intial condition.) c) Use the method of separation of variables to separate the above problem into two sub- problems (one that depends on space and the other only on time) (d) What...
2. We are lo solve y" -ky -) (O < x < L) subject to the boundary conditions y(0)y(L)0. a) Find Gr...
2. We are lo solve y" -ky -) (O < x < L) subject to the boundary conditions y(0)y(L)0. a) Find Green's function by direct construction and show that for x ξ? b) Solve the equation G"- kG -(x - by the Fourier sine series method. is equivalent to the solution Can you show that the series obtained for G(x | found under (a)?
2. We are lo solve y" -ky -) (O
=T 20 marks) Consider the following PDE with boundary and initial conditions: U = Upx +...
=T 20 marks) Consider the following PDE with boundary and initial conditions: U = Upx + ur, for 0<x< 1 and to with u(0,t) = 1, u(1,t) = 0, u(1,0) = (a) Find the steady state solution, us(1), for the PDE. (b) Let Uſz,t) = u(?, t) – us(T). Derive a PDE plus boundary and initial conditions for U(2,t). Show your working. (c) Use separation of variables to solve the resulting problem for U. You may leave the inner products...
solve problem #1 depending on the given information
Consider the following 1D second order elliptic equation with Dirichlet boundary conditions du(x) (c(x)du ) = f(x) (a $15 b), u(a) = ga, u(b) = gb dr: where u(x) is the unknown function, ga and gb are the Dirichlet boundary values, c(x) is a given coefficient function and f(x) is a given source function. See the theorem 10.1 in the textbook for the existence and uniqueness of the solution. 1.1 Weak Formulation...
Consider a potential problem in the half-space defined by 2 20, with Dirichlet boundary conditions on the plane z = 0 and at infinity). (a) Write down the appropriate Green function G(x, x'). (b) If the potential on the plane z = 0 is specified to be 0 Vinside a circle of radius a centered at the origin, and Ø = 0 outside that circle, find an integral expression for the potential at the point P specified in terms of...
use the hint please
2. Show that the Dirichlet problem for the disc t(z,y): +y S R2), where f(0) is the boundary function, has the solution 0o aj COS 1 sin j 3-1 where a, and b, are the Fourier coefficients of f. Show also that the Poisson integral formula for this more general disc setting is R22 (Hint: Do not solve this problem from first principles. Rather, do a change of variables to reduce this new problem to the...
3. Consider the following problem for 0 < x < 1 uzz = f(x) with inhomogeneous boundary conditions u(0) 1, u( 2 (a) Find a Green's function G(x, zo) for this problem, and write down the solution u(z) in terms of G(x, zo) and (x) (b) Solve the problem directly (by integration) in the case when f(x). Show that this gives the same answer as in part (a).
3. Consider the following problem for 0
2. In lectures we solved the heat PDE in 1 +1 dimensions with constant-temperature boundary conditions u(0,t)u(L,t) -0. If these boundary conditions change from zero temperature, we need to do a little bit more work. Consider the following initial/boundary-value problem (IBVP) 2 (PDE) (BCs) (IC) u(0,t) = a, u(x,00, u(L, t)=b, st. and let's take L = 1, a = 1, b = 2 throughout for simplicity. Solve this problem using the following tricks b and A"(x)-0 (a) Find a...
3. In class we discussed the heat conduction problem with the boundary conditions a(0, t) 0, t4(1,t)-0, t > 0 and the initial condition u(r,0) f(a) We found the solution to be of the form where (2n-1)n 1,2,3,. TL 20 Now consider the heat conduction problem with the boundary conditions u(0, t) 1,u(T, t)0, t>0 and the initial condition ur,0) 0. Find u(r,t). Hint: First you must find the steady state.
3. In class we discussed the heat conduction problem...
(1 point) Suppose we have ut = aʻuzz, 0 < x <1,t > 0, boundary conditions are u(0,t) = u(1,t) = 0, and the initial condition is u(x,0) = sin(T2). What will be the behavior of u(x, t) as time increases. There may be more than one correct answer. You do not need to solve the equation to answer this question. A. The solution behaves unpredictably. B. The solution increases to infinity. OC. For a fixed t, the solution will...
1. (10 points, part I) Consider the following initial boundary value problem lU (la) (1b) (1c) 0L, t> 0 3 cos ( a(x, 0) (a) Classify the partial differential equation (1a) (b) What do the equations (la)-(1c) model? (Hint: Give an interpretation for the PDE, boundary conditions and intial condition.) c) Use the method of separation of variables to separate the above problem into two sub- problems (one that depends on space and the other only on time) (d) What...
2. We are lo solve y" -ky -) (O < x < L) subject to the boundary conditions y(0)y(L)0. a) Find Green's function by direct construction and show that for x ξ? b) Solve the equation G"- kG -(x - by the Fourier sine series method. is equivalent to the solution Can you show that the series obtained for G(x | found under (a)?
2. We are lo solve y" -ky -) (O
=T 20 marks) Consider the following PDE with boundary and initial conditions: U = Upx + ur, for 0<x< 1 and to with u(0,t) = 1, u(1,t) = 0, u(1,0) = (a) Find the steady state solution, us(1), for the PDE. (b) Let Uſz,t) = u(?, t) – us(T). Derive a PDE plus boundary and initial conditions for U(2,t). Show your working. (c) Use separation of variables to solve the resulting problem for U. You may leave the inner products...
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