Euclidean Disc with Neumann Boundary Conditions

The region examined here is the Euclidean Disc of radius 1 with Neumann Boundary conditions. This was an important test case for us for the accuracy of MATLAB's FEM solver on curved regions, because the eigenvalue spectrum is known for this region: Eigenvalues correspond to the squares of the zeros of the derivatives of Bessel Functions of the first kind, J'_k(n). Eigenvalues corresponding to zeros of zero-eth Bessel Function, J'_0(n), have multiplicity 1, and Eigenvalues corresponding to zeros of all other Bessel Functions, k>0, have multiplicity 2. This region also helped confirm that the accuracy of the MATLAB FEM solver begins to deteriorate after the first approximately 250 Eigenvalues.

Here are the counting graphs for the eigenvalue spectrum, using the true values since the spectrum is known. The first approximately 550 values were used here. The equation for the predicted counting function is N'(t) = 1/4*t + 1/2*sqrt(t) + 1/6.

Here are the difference graphs for the eigenvalue spectrum, using the true values since the spectrum is known. The first approximately 550 values were used here.

Below is the Eigenvalue spectrum for the Euclidean Disc of radius 1 under Neumann Boundary conditions. The calculated and predicted eigenvalue spectrum is presented here, as well as their true values, and the Bessel zeroes that they correspond to. The columns k and n represent that the value corresponds to the nth zero of J'_k.

Euclidean Disc, r =1, Neumann Conditions          
 Refinements         
Initial1234 PredictedTrue ValueBessel Zerokn
1.42E-143.06E-131.99E-1300 00001
3.4269612773.3992942293.392300163.3905440253.390104348 3.3899620523.3899577171.84118378111
3.4279037853.3995461653.392364763.3905603133.390108431 3.3899621853.3899577171.84118378111
9.5234765659.3776629119.3407406019.3314620039.329138258 9.3283862079.3283632143.05423692821
9.5301129099.3792739989.3411412169.3315620589.329163268 9.3283869299.3283632143.05423692821
15.2236301414.8175158214.7159257314.6904672914.68409552 14.6820333714.681970643.8317059702
18.2599729417.8044330717.6887828617.6597022217.6524181 17.6500606917.649988524.20118894131
18.2769461517.8080290817.6896465117.6599160117.65247142 17.6500620717.649988524.20118894131
29.7972758128.6596539728.3725418528.3004452828.28239224 28.276549628.276371255.31755312641
29.8116514928.6634491228.3735475428.3007015928.28245664 28.2765518828.276371255.31755312641
30.2062074728.8684845128.5354501528.4520950428.4312375 28.4244872228.424282055.33144277412
30.2843577828.8881261728.5403774928.4533281528.43154586 28.4244962928.424282055.33144277412
44.3672761541.9656750941.3619473841.2106296341.17276114 41.1605054741.160133486.41561637651
44.4291682541.9777094641.3648069441.2113362841.17293729 41.1605099341.160133486.41561637651
49.3889936746.0660380445.2455189945.0405727944.98931388 44.9727245744.972222426.70613319422
49.4938873646.0876937145.2505618845.0418047544.98961969 44.9727306444.972222426.70613319422
54.6085701350.5398799749.5476888549.300728949.23902433 49.2190544249.218456327.0155866703
62.3091514657.7814076856.6473667656.3636316956.29265781 56.26968856.268993777.50126614561
62.4564143157.805026856.652616156.3649021156.29297256 56.2696934656.268993777.50126614561
72.9280667366.3891214564.7789574864.3777252964.2774466 64.2449926464.244017738.01523659832
73.2627541266.4538129764.7942918464.3815136364.27839111 64.2450167964.244017738.01523659832
84.0401405375.6129072273.5516187273.0393093872.91134766 72.8699344372.868697118.53631636613
84.0789932275.7866994173.5947136373.0500508972.91403137 72.8700103472.868697118.53631636613
84.3524815376.1890933174.2298602473.7418579173.61992196 73.580458973.579278848.5778364971
84.8562587776.2364532174.2415305973.7447589273.62064659 73.5804791873.579278848.5778364971
101.548227489.9400255487.1027691186.397673786.22157428 86.1645818986.16288089.28239628542
101.949274990.0343312887.1252244286.403213686.2229547 86.1646161486.16288089.28239628542
110.115050297.3022796594.1227291493.3348132493.1382373 93.0746179493.072744539.64742165281
110.474752197.3633942594.1426143293.3400933593.13957974 93.07468693.072744539.64742165281
120.1898873104.4861914100.655809899.7062692899.46926823 99.3925657999.390288689.96946782323
121.1472891104.7191718100.713511299.7206749799.47286958 99.3926704499.390288689.96946782323
127.4315955109.3220372104.9411373103.859137103.5893394 103.5020227103.499453910.1734681404
135.6652413116.8251246112.1964963111.0491925110.7628788 110.670217110.667472810.5198608752
136.6428163117.013561112.2400035111.0598516110.7655303 110.6702769110.667472810.5198608752
141.0421061121.2592008116.3538113115.1388231114.835777 114.7376999114.734817710.7114339791
141.4986389121.3291058116.369992115.1428188114.8367746 114.7377272114.734817710.7114339791
163.2469995137.2775685130.8515472129.259621128.8623738 128.7338097128.729998511.3459243133
164.7266654137.5801975130.9190547129.2759103128.8664047 128.7338733128.729998511.3459243133
174.8519516146.8930219139.4864448137.6436546137.1837823 137.0349504137.030550811.706004914
176.3756462147.0820135139.6023451137.672538137.1909798 137.0351295137.030550811.706004914
177.2231617147.4831311140.064404138.2964722137.8556171 137.7129398137.708721811.7349359562
178.7282735147.7310976140.1472203138.3147848137.8600388 137.712866137.708721811.7349359562
179.229334148.1415655140.9195384139.143404138.7009094 138.5577015138.553537711.77087667101
180.1653124148.4555106140.9869117139.1592133138.7047974 138.5577313138.553537711.77087667101
213.057555174.0528127164.1046613161.6473374161.0348346 160.8366056160.830801712.6819084443
213.8375779174.3674685164.1855598161.6676567161.0399226 160.8367642160.830801712.6819084443
218.6130635178.289036167.9190477165.3660691164.7305046 164.524812164.518877212.82649123111
220.2677553178.4238115167.9451287165.3721972164.7320132 164.5248256164.518877212.82649123111
223.6191623181.4889576170.7637443168.1230869167.4655733 167.2527772167.246613812.9323862472
225.6408031181.6761495170.7899037168.1284508167.4668403 167.2527183167.246613812.9323862472
234.2561405189.0578198177.3004867174.4155017173.6976771 173.465362173.458668513.1703708624
235.7119739189.6253823177.4461146174.4518736173.706761 173.4656146173.458668513.1703708624
241.2498952194.21786181.6405012178.5470099177.7771184 177.5279526177.520766813.3236919405
264.3833387211.7209949197.3360759193.7960219192.9154258 192.6304318192.62228513.87884307121
265.6129888211.8348617197.353313193.7999065192.9163764 192.6304329192.62228513.87884307121
267.698905214.8344614200.403417196.8292874195.9382621 195.6498929195.641445813.9871886353
272.66372215.4576876200.5210372196.8572099195.9451718 195.650002195.641445813.9871886353
275.3663273219.4408629204.2125288200.482971199.5562819 199.2563705199.24787414.1155189182
281.9101096220.0259623204.318952200.5076857199.5623508 199.2564049199.24787414.1155189182
292.0979571235.0194925218.2760471214.1263629213.0916729 212.7568084212.746970214.5858482934
296.4939503236.3264902218.5821683214.201069213.1102289 212.757192212.746970214.5858482934
304.0035277245.8240286227.1074502222.4674565221.3113354 220.9371711220.926267114.8635886315
310.3432603246.2387571227.1873314222.4861276221.315928 220.9372074220.926267114.8635886315
316.1888166248.8524928229.228789224.4400689223.2517045 222.867105222.85636514.92837449131
319.4916159248.9501139229.2562102224.4471477223.2534876 222.8671744222.85636514.92837449131
322.9201411259.2144712239.6977234234.7768543233.5331185 233.1305989233.117365115.2681814663
332.5230962260.5648975239.8809438234.8121377233.5418833 233.1307812233.117365115.2681814663
339.1890255262.4022981240.5813343235.3702259234.1030967 233.6930061233.684348515.2867376792
345.6935762262.8269905240.7767478235.4416363234.1225596 233.6956568233.684348515.2867376792
348.5126902286.3971562262.7261638256.8185721255.3440867 254.8668877254.852713515.9641070444
359.0553121287.5012505262.9393694256.8680637255.3562021 254.8669069254.852713515.9641070444
368.1303352289.6849603263.6498151257.3086791255.7371902 255.2285973255.214645115.97543881141
371.3156536289.8066055263.6834292257.317312255.7393896 255.2287146255.214645115.97543881141
374.1467323302.0540007275.9825985269.426343267.7877222 267.2574029267.241485916.3475223225
382.1581048304.8890948276.65519269.590984267.8285989 267.2582249267.241485916.3475223225
389.6237778307.217551279.6239622272.7989995271.0982962 270.5478846270.5318616.44785275102
397.4810226308.4549959279.8555817272.8531813271.1116211 270.5479867270.5318616.44785275102
398.6078046310.103736280.8043818273.6471029271.8720699 271.2976025271.281654316.4706300506
402.9260693311.406815282.4825142275.5124935273.7916419 273.2347096273.219936516.5293658873
412.5946041312.4768183282.5932189275.5339282273.7967342 273.234513273.219936516.5293658873
419.3392366334.5504126300.6696299292.413543290.3704944 289.7092871289.691404317.02032327151
424.1493387334.6557365300.6796063292.4169522290.3714081 289.7093931289.691404317.02032327151
429.1605372343.0111822310.5757093302.4433072300.4116735 299.7541604299.73451517.3128424954
430.276463344.6167102310.8353024302.498924300.4249985 299.7537983299.73451517.3128424954
438.0931407358.4150821321.7405048312.7464852310.5126987 309.7897615309.769382917.60026656112
451.7915265359.8006974322.0154636312.8105699310.5284215 309.7898324309.769382917.60026656112
460.0525784364.7540912327.9570472318.922901316.6692431 315.9398747315.915515617.7740123783
463.1061125365.3145394328.2439545319.0205768316.6935907 315.9404905315.915515617.7740123783
469.5256934369.0380767329.0411816319.5254606317.2069371 316.4565758316.439550617.7887478735
473.3562221372.1615154330.0786746319.8096807317.2774243 316.457891316.439550617.7887478735
483.0352892378.8758273338.3799875327.9880043325.4147915 324.5820031324.559244218.0155278616
494.1447619381.0721831338.563015328.0262274325.4239137 324.5817072324.559244218.0155278616
497.9341215382.2426056339.4852657329.5699957327.1027211 326.3042183326.281542218.06326499161
513.9042412389.6226868341.2110384329.9552316327.1963349 326.3034523326.281542218.06326499161
517.611068406.8519002362.0828359351.0227294348.2706259 347.3799417347.354281918.6374430164
522.2620511407.2776276362.1562813351.0386771348.2744725 347.3798719347.354281918.6374430164
528.9985286414.4232052366.8905572355.2315942352.3401401 351.4043569351.378433518.74509092122
530.8979137415.7516622367.082152355.2722404352.3498767 351.4040899351.378433518.74509092122
540.4718884427.0796466377.2432697365.1599113362.1690326 361.2010719361.174575519.0045935493
543.97865428.3637152377.612784365.2534216362.192377 361.2017079361.174575519.0045935493
555.3677601437.4331856382.5904382369.3338277366.0656056 365.0078861364.980477519.10446224171
560.9327856439.2289805382.8855948369.3996366.0815967 365.0077662364.980477519.10446224171
568.9905141439.5643952385.8030337372.7727913369.5561471 368.5151202368.487521719.196028845
573.8101227440.1548636386.0641477372.8587713369.5789484 368.5174745368.487521719.196028845
578.833052455.7172076399.1246375385.3110496381.8909146 380.7840304380.753765319.5129127826
584.4898003459.5172986400.3853617385.6307821381.9708577 380.7863686380.753765319.5129127826
594.9335505465.2429493404.3451525389.6229337385.9890806 384.8130291384.781905119.6158585107
599.2461547474.2395718414.8703996400.1976404396.5546182 395.3755993395.34261119.88322436132
600.9272036477.1738407415.3545026400.2989314396.5787827 395.3748027395.34261119.88322436132
615.9375347477.5090445417.0897143402.4939192398.8795506 397.709805397.677515719.9418533774
624.8614286478.0995483417.1811367402.5126643398.8839338 397.7095403397.677515719.9418533774
629.4365893494.406444427.6369227411.1837521407.1572751 405.8541557405.78406820.1440827181
640.1816429495.8149514428.1617897411.2981345407.169204 405.8235423405.78406820.1440827181
649.7072245496.0221612429.8722226414.1388771410.2594786 409.0039594408.970999520.22303141103
652.9257802499.0619845430.1159381414.1987159410.274269 409.0041705408.970999520.22303141103
660.568164514.136494445.7496216428.9177284424.7412249 423.3895513423.351797820.5755145255
673.1117558517.6582164446.4047594429.0604371424.7755387 423.3887845423.351797820.5755145255
674.9828732537.0424528464.1543764445.9101231441.3604044 439.8879444439.844788920.9724769436
714.0448773541.2588957465.7391331446.3022477441.4576251 439.8897231439.844788920.9724769436
745.5068152542.0266469466.2271364447.7423576443.1678855 441.6874144441.647244621.01540493142
755.1638597543.7490066466.5547568447.812538443.1848068 441.687099441.647244621.01540493142
759.3247828552.0451278474.0992075454.4421966449.553816 447.9717523447.930551521.1643698617
764.2547925555.5630901474.7748251454.5919321449.589361 447.970341447.930551521.1643698617
779.9817375557.0033638475.5950527455.3210304450.340373 448.7284451448.688546721.18226963191
781.4736911558.8384012475.9176204455.485373450.3801351 448.7278882448.688546721.18226963191
812.3962181562.6418041476.0814566456.7999721452.1990719 450.7100476450.673099821.2290626284
819.5834134564.3557173476.4257565456.9677486452.2422858 450.7129483450.673099821.2290626284
827.6690558569.0287705485.8222198465.829886460.9130688 459.3218019459.281513421.43085424113
835.5051481570.7508695486.1743168465.9058912460.9312071 459.3212123459.281513421.43085424113
861.8641568597.9040421509.9312102488.1780213482.7910716 481.0476522481.000123621.9317150265
868.1046951600.2298893510.1916767488.2317713482.8038734 481.0472016481.000123621.9317150265
877.7092458613.631415520.5807883497.7842098492.1515639 490.3286279490.279117522.14224735152
907.0188109615.9609645521.0533967497.8980544492.1797191 490.3290508490.279117522.14224735152
925.0296999626.5827823526.9477802501.8660161495.7243553 493.7366829493.690470422.21914648201
947.4018802628.8943328527.0658608501.8809289495.7271146 493.7355089493.690470422.21914648201
965.2364544631.108872533.7423745509.8462137503.817503 501.8663856501.806246722.4010322746
1042.521481632.1408141534.4266595510.029558503.864934 501.8698299501.806246722.4010322746
1117.815849640.8030469538.380063514.1390077508.2583324 506.3551248506.312944722.5013987394
1136.593023641.2131514538.5003757514.2106456508.2815681 506.3626957506.312944722.5013987394
1159.608464649.990452545.3998026520.2732728514.1229046 512.1324142512.085232222.6293003123
1191.664818652.9765276545.7364434520.3353894514.1371232 512.1311313512.085232222.6293003123
1200.728749659.1030792548.6339344522.5006582516.1157211 514.0493155514.000620122.6715817727
1244.240233662.7102984550.4960916522.99171516.2388845 514.0534163514.000620122.6715817727
1344.566971672.4745119554.5952257526.9705631520.2465813 518.070448518.02144122.7600843808
0687.1182832577.4829948550.250757543.22279 540.9482757540.78667723.25482051211
0691.545974578.1899495550.3014752543.2331011 540.9455095540.78667723.25482051211
0694.388065578.5186952550.4160203543.5211294 541.2896836541.40228723.2680529375
0694.7282389578.7697535550.6023535543.5602432 541.2811515541.40228723.2680529375
0704.9172935581.0813956550.7689426543.6436317 541.3376132541.226248523.26426978162
0708.6981728581.4780018550.876698543.6939318 541.3693186541.226248523.26426978162
0719.4280541602.8885966574.1857516566.9864494 564.6564846564.571618223.76071586104
0721.2311165603.2873942574.3120739567.0228553 564.6637901564.571618223.76071586104
0736.1109649608.3181804576.9253091569.1719923 566.6627275566.610491123.8035814856
0736.4845958608.6200606577.1098908569.2164741 566.6618677566.610491123.8035814856
0740.275311609.0284476577.4573943569.8672051 567.4107345567.363296623.81938909133
0745.4128475609.9227481577.5541068569.8885405 567.407675567.363296623.81938909133
0762.0169493627.0962006593.8877465585.6963989 583.0453709582.97607224.1448974337
0769.821977629.1379433594.3927525585.8220692 583.0482739582.97607224.1448974337
0774.7457392637.1860876601.6914872592.8941123 590.0469511589.974250124.28938554221
0778.6300385637.6373457601.8070496592.9208526 590.0449452589.974250124.28938554221
0783.0061838638.0052968602.5335502593.8984771 591.1038428591.040613624.3113268618
0783.4623184638.5560984602.6670453593.9300722 591.1024593591.040613624.3113268618
0785.1769621640.2372248605.6188283597.2483201 594.5393089594.477715724.3819137172
0790.4536186640.5772541605.7424908597.2781361 594.5387528594.477715724.3819137172
0791.5602161649.663553615.6397393607.2974933 604.5976289604.530280224.5871974985
0795.3192123651.1249871616.0157569607.390983 604.599682604.530280224.5871974985
0813.4729941671.7245941636.7612034628.072079 625.2599517625.098578925.0019715143
0821.348674673.2970973637.0921335628.1309195 625.2307338625.098578925.0019715143
0832.4944614676.3249458637.8525737628.4570957 625.4163658625.426007825.0085187114
0836.146169676.8825348637.974786628.5053851 625.440731625.426007825.0085187114
0843.8585461685.7902714646.9157955637.3876788 634.3040221634.230108625.183925666
0848.0321722686.8870099647.1841646637.4534435 634.3042163634.230108625.183925666
0863.9842736698.1189121655.2284442644.7276637 641.3292163641.250490525.32292421231
0869.9533049698.2854298655.2676874644.7374175 641.3294263641.250490525.32292421231
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0002114.6315822018.859972 1987.8646781987.34279944.57962314413
0002119.7285412020.216166 1988.0102211987.34279944.57962314413
0002128.9512982031.169796 1999.5240261999.39129844.71455353214
0002136.2836132033.407547 2000.1129851999.39129844.71455353214
0002137.9591172036.465993 2003.6190022003.39663744.759319014
0002147.5984212046.012513 2013.1354942009.76766444.83043235421
0002149.0221812046.084125 2012.7695012009.76766444.83043235421
0002157.4148182054.366562 2021.0162732022.97786844.977526251110
0002157.7488072054.628319 2021.2546522022.97786844.977526251110
0002159.0853822058.898894 2026.4747812027.28900545.02542621168
0002159.7456012059.175691 2026.6274882027.28900545.02542621168
0002168.4542062067.337951 2034.6129292034.15964945.10165905362
0002169.0274252067.413253 2034.5270872034.15964945.10165905362
0002172.3231732073.945159 2042.1063352041.66008645.18473289284
0002173.5641462074.127302 2041.9458022041.66008645.18473289284

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