Mesh Definition and 224 Threads

Hello everybody. I'm new with Comsol and I'm working with the 4.3b version. I'm trying a simulation of a sphere (in 3D, of course) and I want to figure out in how many points is Comsol evaluating the ecuation. I know I set the maximum and minimum size of the tetrahedrals (I'm using tetrahedrals...

http://photouploads.com/images/untitleda.png Basically, in the last step, why have they done I3 - I2 rather than the other way round? Thanks PS: I have not embedded the image because its size is too large..

I considered loop I1 and got the correct equation for it. Then I applied the mesh analysis method to loop I2 but I'm getting one term wrong (its sign). Starting in the top left corner of loop I2, 30I2 - 90(I2 -I3) - 5(I1 - I2) = 0 Everything is correct apart from the -90, its supposed to be...

At high school we were taught basic circuit formulas such as V=IR, P=IV etc but now I am studying circuits in Engineering (at university) we have been introduced to the techniques of nodal and mesh analysis. My question is, when and why do we use these techniques rather than the...

As in the subject. I have created tri mesh on my solid and it is completely irregular. Does it have any impact on later results of the analysis? Can it be repaired somehow? I attached a picture in case you would like to see it. I am working with Marc MSC

Homework Statement I am having a little trouble using mesh analysis. I'm trying to stick rigorously to the passive sign convention, as I'm told that this is sensible. Consider the circuit diagram attached, where I have added the mesh currents in orange. In red are the polarities for the...

Homework Statement Use mesh current analysis to determine I1 Homework Equations Loop 1 47i1+j100(i1+i2)-12=0 (47+j100)i1+j100i2=12 Loop 2 -j75i2+j100(i1+i2)-10=0 j100i1+j25i2=10 The Attempt at a Solution Homework Statement Homework Equations j100i1+j25i2=10 (-4)...

Homework Statement For the circuit given in Fig 15.53, (a) draw the s-domain equivalent; (b) write the three s-domain mesh equations; (c) determine i1, i2, and i3. Homework Equations Laplace Transform table Zc=1/SC Zl=SL The Attempt at a Solution I have uploaded my work but what...

Use mesh-current analysis to determine currents I1, I2 and I1 + I2 for the network shown.My calculation so far: Mesh A: v1+v2=12∠00 Mesh B: -v2+v3=-10∠00 v1=i1RA=(47Ω)iA v2=iAR2=R2(iA-iB)=(j100Ω)(iA-iB) v3=iBR3=(-75j)iB Mesh A: (47Ω)iA+(j100Ω)(iA-iB)=12∠00 Mesh B...

1 Problem Statement: 2 Relevant Equations KVL KCL Ohm's Law 3 Attempt at Solution I solved Problem 4.2, which was just mesh analysis on the original problem. I got the correct answers, indicated by F.A. The problem I am having with 4.3 is how to redraw the circuit with the...

Homework Statement Apply mesh analysis to determine the magnitude and phase of the currents in the circuit of FIGURE 4, given the values in TABLE A Vs = 20 Vrms Z1 = 0 - j5 Ω Z2 = 5 + j5 Ω Z3 = 5 + j5 Ω Z4 = 0 - j10 Ω Z5 = 10 + j0 Ω Homework Equations KVL Simultanious...

Homework Statement Find the three mesh current. Homework Equations KVL The Attempt at a Solution I numbered the loop 1 with 2 and 3 ohms, loop 2 with 3, 5, and 212 V, and loop 3 with 3, 122V, and 5. All currents are clockwise. So for Loop 1: 2i1+3(i1-i2)=0 Loop...

Hi, I have a mesh whose surface is made up of tesselating triangles. I would like to perform an integral over this surface of the form \int f(\Omega) R(\Omega) d\Omega Where f is an arbitrary function and R is the radius at that point. I have a method implemented but it is not working...

Homework Statement The question asks me to find io by using mesh analysis. Homework Equations KCLThe Attempt at a Solution In fact, the question also asks me to find it by superposition and I found the answer should be: i0=0.1+0.218 cos⁡(2000t+134°)-1.18 sin⁡(4000t+7.4°) But I don't know how...

Is it possible to measure the resistance across a wire mesh with a multimeter? Thanks.

Could anyone tell me what is the mathematics of the 2D and 3D mesh? Thank you

I am building a circuit that is hooked up to a 1.2v NiMH battery. I will be using a wire mesh similar to this: https://www.amazon.com/s/ref=sr_pg_1?rh=n%3A16310091%2Ck%3A304+wire+mesh&keywords=304+wire+mesh&ie=UTF8&qid=1363133769&tag=pfamazon01-20 Unless there is a better mesh for this...

Homework Statement http://imageshack.us/a/img834/5512/homeworkprobsg216.jpg Using superposition, find i.Homework Equations V = IR, KVL, KCL, Nodal / Mesh analysis, voltage division, current divisionSuperposition procedureThe Attempt at a Solution So this time the dependent source is a...

Homework Statement Find i1 in the following figure, given: Vs=10V, I=1A, R1=5, R2=2, R3=4 Homework Equations KVL The Attempt at a Solution Applying KVL to mesh 1: Vs-i1R1-(i1-i2)R3=0 and i2=I=1A So, i1=(Vs+i2R3)/(R1+R3)=(10+1*4)/(5+4)=14/9=1.56 A But book gives answer as...

Homework Statement In the figure ε = 9.55 V, R1 = 2090 Ω, R2 = 3360 Ω, and R3 = 4440 Ω. What are the potential differences (in V) (a) VA - VB, (b) VB - VC, (c) VC - VD, and (d) VA - VC...

Homework Statement http://img541.imageshack.us/img541/5039/homeworkprobsg27.jpg Find the value of the voltage Vm Homework Equations V = IR, KVL, KCL, mesh equations, nodal equations The Attempt at a Solution...

Homework Statement Apply the mesh current method to find I0 Homework Equations Mesh current method The Attempt at a Solution On the left bottom square circuit, I set a mesh current, I1, and on the right bottom square circuit, I set a mesh current, I2. Then, I0=I1-I2. Since...

Homework Statement http://imageshack.us/a/img90/4018/homeworkprobsg25.jpg Find the three mesh currentsHomework Equations V = IR, KCL, KVL, Mesh / maybe nodalThe Attempt at a Solution I'm not quite sure how to set up the equations but I#1 = 4A right off the bat, for sure. I may need some...

Hi Guys, I 'm currently trying to make a 2D model of a sector of a compressor disk with the blade attached to it by means of a frictional contact (as shown in the attached pic). The contact between the blade and disk is frictional (coeff=0.25), augmented lagrange formulation, and adjust to...

We are beginning a project in my Intermediate Fluids class to make a program that can do aerodynamic analysis on an air foil. First, given any three nodal coordinates (x,y) of a triangle, we must write a program to compute its surface vectors and area of the triangle. The nodes will be in...

Homework Statement Hi, I'm trying to find what I(t) and V2(t). https://dl.dropbox.com/u/672601023 The Attempt at a Solution - Firstly I'm changing to impedances and then predefining a few new variables - zc1, zr1, zc2, zr2 and zc3 - then I'm going to do mesh analysis...

Homework Statement EDIT: I THINK I FIGURED IT OUT, JUST NEED SOMEONE TO CONFIRM. I think the reason why my mesh analysis is wrong is because there is a voltage drop across the current source. Am I right? Here is the problem along with my attempt Find Io using mesh analysis: Alright so if...

Homework Statement Homework Equations V=I*R The Attempt at a Solution I started writing the equations for each loop. Loop 1 -> I1=8A Loop 2 -> -6Ix + 4I2 + 2(I2-I3) =0 and Ix=I4-I2 Loop 3 -> I don't know how to approach the dependent current source here. Loop 4...

When I apply the equations in phasor domain V1=jω(L1)(I1)±jωM(I2) and V2=jω(L2)(I2)±jωM(I1) and then mesh analysis should I consider the other mesh on the far right side with the capacitor? In other words, this is the first problem that I've seen or had such as this and since I2 is a...

Suppose a square metal mesh sheet is hung off-center from a string and you are charged with the task of hanging various weights so that the mesh will be in static equilibrium, roughly horizontal. Why is it that this task must be done with masses that can exert torques large enough to flex the...

Homework Statement Mesh and nodal analysis are used to find unknown currents and voltages in planar networks. Why is it necessary when performing these network analyses that all of the source frequencies be the same? The attempt at a solution I know that superposition let's us analyze...

How to solve non planar circuits using mesh analysis? Is it possible or not?

I need to perform mesh analysis using complex numbers on an AC circuit. My issue, is I don't understand how to do this. The circuit contains only one voltage source, where we have only been taught how to perform a mesh analysis on a circuit that contains 2 voltage sources. Can someone show me...

Solve i_x when a=2. (See attached picture) This is my attempt (mesh current analysis): I made i1 be the lower left loop current. I made i2 be the lower right loop current. I made i3 be the upper loop current. Mesh1: i1 = 2ix Mesh2: -10 + 3(i2-i3) + 20i2 = 0 Mesh3: -5 + 3(i3 -...

I'm currently attempting to implement the "Particle mesh ewald" method for a molecular dynamics simulation. It has the advantage of having an algorithmic complexity of O(n log(n)), compared to a normal O(n^2) complexity for a regular approach. I've been reading through the original papers for...

Homework Statement Develop the mesh-current matrix equation for the circuit. http://i.imgur.com/tvZA0.png Homework Equations ƩV_{n} = 0 The Attempt at a Solution I used Mesh current analysis to find 4 equations, but the equations for the first and second mesh are not related...

Hi Guys, I have an query. I would like to know the best tool for Simulation, Geomtry and Mesh creation. I want to simulate a duct with a turbine in it as a Part of my research project. I am beginner for the simualtion field so please suggest accordingly the appropriate software. Also please...

Dear All, I have encountered the following situation: Given a node that is connected through n resistors to n ports. One if the resistors is a negative resistance and equals to minus of all other resistors in parallel. \frac{1}{R_n} =- \sum_{i=1}^{n-1} \frac{1}{R_i} Using the well known...

Hi, I have to solve a 3-phase circuit using mesh analysis. The source is a balanced Delta Phase A = 480V at 0 deg, Phase B is at -120 deg, and Phase C is at 120 deg. The load is a balanced Wye load at 0.99 + j 0.66. My mesh equations are as follows: Vab = I1 * ( Z1 + Z2) - I2 * Z2 Vbc =...

Hello, The value of electric potential(∅) is known at every node in a 3d finite element mesh. The relation between electric current density(i) and electric potential(∅) is i=k.∇∅, I am writing a code in c, I want to know how to find the gradient of electric potential(∇∅) at every node so...

Hi, i need some help in writing the surface mesh in abaqus. i have a wing model, meshed using hexahedral mesh. now what i want is to write the surface element detail on a file, containing the element number and its neighbouring four nodes. for example 12, 2 3 5 6 here 12 is the element number...

hi ! i have created finite element mesh in abaqus. i need to export this mesh i.e. the nodes and element details on a file. can anyone guide me in this respect

I've been asked to teach an electrical engineering course, due to lack of EE people at my college. I've been running through Mesh , nodal analysis etc. Its seems like these are just variations of using kirchhoffs voltage and current continuity equations. It seems pointless to me, I've...

Homework Statement Using matrix algebra calculate the voltage expected across each resister in the circuit diagram. Only need the simultaneous equations. The Attempt at a Solution -15=6800(I_b-I_a )+2200(I_b-I_c) 15=2200(I_c-I_b )+8200(I_c-I_d) -25=8200(I_d-I_c )+4700I_d Thanks for any help.

Homework Statement Find the node voltage method equations. Do not solve Find the mesh current method equations. Do not solve Homework Equations NoneThe Attempt at a Solution Using nodal analysis: Node v1 : -Is4+(v1-v2)/2+v1/20-10=0 Node v2 : Is4+(v2-v1)/2+3+(v2-30)/5=0 Looking at this I feel...

I'm using COMSOL 4.0a. Whenever I apply a free tetrahedral mesh, I can see it on the structure immediately. However, now I need to use a moving mesh to combine the results of structure deflection and fluid flow. I cannot get the solver to compute without errors. Am I supposed to immediately...

Hi! I have to do cartesian mesh of 3d object. I have to do this in Matlab. It will be a part of FEM programme. I've read sth about Delanuay triangulation etc, but I have to do really simple disretization sth like in http://en.wikipedia.org/wiki/Regular_grid (Example of a Cartesian grid.)...

hi what is concept of mesh cutoff energy? what is concept of Fermi energy in semiconductor and metallic CNTs?

given Electric circuit, i asked to find each current (I1 I2 I3 I4) by using Mesh Current Method. so how you can see in the picture i marked the directions for the 4 currents in blue color. and i wrote the equations in red color. what i am not sure is if the equations for I3 and I4 is...

I have performed interpoaltion of applied pressure from one mesh (mesh of tetra elements) to another mesh (mesh of brick elements). I have done the interpolation. I want to introduce some checks if my interpoaltion is rightly done.. Please can anyone advise what could be the checks that...