Bundle: Welding: Principles and Applications, 8th + MindTap Welding, 4 terms (24 months) Printed Access Card
8th Edition
ISBN: 9781337219426
Author: Larry Jeffus
Publisher: Cengage Learning
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Textbook Question
Chapter 19, Problem 18R
Why is a lace bead more easily controlled than a weave bead?
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Figure 3 shows the numerical solution of the advection equation for a scalar u along x at three
consecutive timesteps.
1.0
0.8-
0.6
0.4-
0.2
0.0
00
-0.2
-0.4
-0.6-
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
Figure 3: Advection equation, solution for three different timesteps.
Question 2
Figure 3 shows the numerical solution of the advection equation for a scalar u along x at three
consecutive timesteps.
1.0
0.8-
0.6-
0.4-
0.2-
0.0-
-0.2-
-0.4-
-0.6
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
Figure 3: Advection equation, solution for three different timesteps.
a) Provide an explanation what conditions and numerical setup could explain the curves. Identify
which of the three curves is the first, second and third timestep.
b) Consider explicit schemes with central and upwind discretisations. Explain how each of these
candidate discretisations could produce the behaviour shown in Figure 3.
c) Determine the CFL number that was used in the simulation for each of the candidate schemes for
all possible updates.
Assume that the timestep and mesh-width used are constant. Read the data to two digits of
accuracy from Figure 4 shown at the end of the question, which is an enlarged version of Figure 3.
Demonstrate your method and input data for one calculation, but then use a…
answer please
Chapter 19 Solutions
Bundle: Welding: Principles and Applications, 8th + MindTap Welding, 4 terms (24 months) Printed Access Card
Ch. 19 - The AWS SENSE Level 1 Workmanship Qualifications...Ch. 19 - What skills are needed to successfully complete...Ch. 19 - What type of inspection must the welds pass?Ch. 19 - List three items that can be checked during a...Ch. 19 - What is the maximum acceptable size of the face...Ch. 19 - What is the maximum weld size for lap and tee...Ch. 19 - What would be the maximum acceptable depth of...Ch. 19 - What is the maximum acceptable root face concavity...Ch. 19 - Describe how to perform a free bend test to help...Ch. 19 - What part of a weld is the free bend designed to...
Ch. 19 - How can the 1-in. (25-mm)-wide strips be cut out...Ch. 19 - What is the range of diameters of the filler metal...Ch. 19 - What welding current is used on the carbon steel...Ch. 19 - What are the F-number and A-numbers for the...Ch. 19 - Why are solvents or detergents needed?Ch. 19 - Why might it be necessary to reclean the part...Ch. 19 - What welding current is needed for the GTA welding...Ch. 19 - Why is a lace bead more easily controlled than a...Ch. 19 - What advantage is there in making a small root...Ch. 19 - Why should the filler passes on a single-V butt...
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