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# Asymptotic boundary condition

- To: femm@yahoogroups.com
- Subject: Asymptotic boundary condition
- From: marco valcavi <mvalca@yahoo.com>
- Date: Tue, 5 Feb 2002 00:08:40 -0800 (PST)
- In-reply-to: <3C5742B0.9AD76141@earthlink.net>

    Hello
    I tried to make a simple simulation to verify the
    asymptotic b.c.
    I take a coil with a current and I simulate the B
    field at 1 m on axis (B1) and 90° off axis (B2). In
    the field produced by a dipole the ratio between B1
    and B2 should be 3 but with the mixed b.c. and the
    appropriate c0 I find that the ratio is nearly 2.
    I make an error somewhere?

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    [Format] = 3.0
    [Frequency] = 0
    [Precision] = 1e-008
    [LengthUnits] = millimeters
    [ProblemType] = axisymmetric
    [Coordinates] = cartesian
    [Comment] = "Spira percorsa da corrente.\n"
    [PointProps] = 0
    [BdryProps] = 1
    <BeginBdry>
    <BdryName> = "New Boundary"
    <BdryType> = 2
    <A_0> = 0
    <A_1> = 0
    <A_2> = 0
    <Phi> = 0
    <c0> = 796000
    <c1> = 0
    <Mu_ssd> = 0
    <Sigma_ssd> = 0
    <EndBdry>
    [BlockProps] = 2
    <BeginBlock>
    <BlockName> = "Copper"
    <Mu_x> = 1
    <Mu_y> = 1
    <H_c> = 0
    <H_cAngle> = 0
    <J_re> = 10
    <J_im> = 0
    <Sigma> = 58
    <d_lam> = 0
    <Phi_h> = 0
    <LamType> = 0
    <LamFill> = 1
    <BHPoints> = 0
    <EndBlock>
    <BeginBlock>
    <BlockName> = "Air"
    <Mu_x> = 1
    <Mu_y> = 1
    <H_c> = 0
    <H_cAngle> = 0
    <J_re> = 0
    <J_im> = 0
    <Sigma> = 0
    <d_lam> = 0
    <Phi_h> = 0
    <LamType> = 0
    <LamFill> = 1
    <BHPoints> = 0
    <EndBlock>
    [CircuitProps] = 0
    [NumPoints] = 6
    50	0	0	0
    60	0	0	0
    0	100	0	0
    0	-100	0	0
    0	1000	0	0
    0	-1000	0	0
    [NumSegments] = 3
    4	2	-1	0	0	0
    2	3	-1	0	0	0
    3	5	-1	0	0	0
    [NumArcSegments] = 4
    0	1	180	5	0	0	0
    1	0	180	5	0	0	0
    3	2	180	10	0	0	0
    5	4	180	10	1	0	0
    [NumHoles] = 0
    [NumBlockLabels] = 3
    55	1	1	1	0	0	0
    410	470	2	20	0	0	0
    40	50	2	10	0	0	0

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