/MAT/LAW18 (THERM)

Block Format Keyword This law describes thermal material.

Format

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
/MAT/LAW18/mat_ID or /MAT/THERM/mat_ID
mat_title
ρi ρ0            
ρ0Cp A B        
fct_IDT T0 FscaleT          
fct_IDsph fct_IDas Fscalesph FscaleE FscaleK    

Definitions

Field Contents SI Unit Example
mat_ID Material identifier

(Integer, maximum 10 digits)

 
mat_title Material title

(Character, maximum 100 characters)

 
ρi Initial density

(Real)

[kgm3]
ρ0 Reference density used in E.O.S (equation of state).

Default ρ0 = ρi (Real)

[kgm3]
ρ0Cp Specific heat

(Real)

[kgs3mK]
A Conductivity coefficient A

(Real)

[Wm2K]
B Conductivity coefficient B

(Real)

 
fct_IDT Function f(t) identifier for T. 9
= 0
T is computed
= n
T=T0f(t)

(Integer)

 
T0 Initial temperature

Default = 300K (Real)

[K]
FscaleT Time scale factor

(Real)

 
fct_IDsph Function g(T, E) identifier for temperature versus energy. 7

(Integer)

 
fct_IDas Function h(k, T) identifier for conductivity versus temperature.

(Integer)

 
Fscalesph Temperature scale factor.

(Real)

[K]
FscaleE Energy scale factor.

(Real)

[J]
FscaleK Conductivity scale factor.

(Real)

[Wm2K]

Comments

  1. This material can be used:
    • as purely thermal material (only Line 4 is read)
    • as boundaries conditions (temperature or flux) (use Line 5)
  2. The k MathType@MTEF@5@5@+=feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbwvMCKfMBHbqefqvATv2CG4uz3bIuV1wyUbqedmvETj2BSbqefm0B1jxALjhiov2DaebbnrfifHhDYfgasaacH8akY=xipgYlh9vqqj=hEeei0xXdbba9frFf0=yqFf0dbba91qpepeI8k8fiI+fsY=rqaqpepae9pg0FirpepesP0xe9Fve9Fve9qapdbaGaaiGadiWaamaaceGaaqaacaqbaaGcbaGaam4Aaaaa@3AC6@ (thermal conductivity) is computed as:(1)
    k=A+BT MathType@MTEF@5@5@+=feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaam4Aaiabg2da9iaadgeacqGHRaWkcaWGcbGaeyyXICTaamivaaaa@3D7F@
  3. The α (thermal diffusivity) is computed as:(2)
    α=k/ρ0Cp MathType@MTEF@5@5@+=feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaeqySdeMaeyypa0Jaam4Aaiaac+cacqaHbpGCdaWgaaWcbaGaaGimaaqabaGccaWGdbWaaSbaaSqaaiaadchaaeqaaaaa@3ED8@

    Where, Cp MathType@MTEF@5@5@+=feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaam4qamaaBaaaleaacaWGWbaabeaaaaa@37E0@ is the heat capacity at constant pressure.

  4. The k MathType@MTEF@5@5@+=feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbwvMCKfMBHbqefqvATv2CG4uz3bIuV1wyUbqedmvETj2BSbqefm0B1jxALjhiov2DaebbnrfifHhDYfgasaacH8akY=xipgYlh9vqqj=hEeei0xXdbba9frFf0=yqFf0dbba91qpepeI8k8fiI+fsY=rqaqpepae9pg0FirpepesP0xe9Fve9Fve9qapdbaGaaiGadiWaamaaceGaaqaacaqbaaGcbaGaam4Aaaaa@3AC6@ (thermal conductivity) is given by curve fct_IDas=k(T) MathType@MTEF@5@5@+=feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbwvMCKfMBHbqefqvATv2CG4uz3bIuV1wyUbqedmvETj2BSbqefm0B1jxALjhiov2DaebbnrfifHhDYfgasaacH8akY=xipgYlh9vqqj=hEeei0xXdbba9frFf0=yqFf0dbba91qpepeI8k8fiI+fsY=rqaqpepae9pg0FirpepesP0xe9Fve9Fve9qapdbaGaaiGadiWaamaaceGaaqaacaqbaaGcbaGaamOzaiaadogacaWG0bGaaGzaVlaac+facaaMb8UaamysaiaadseadaWgaaWcbaGaamyyaiaadohaaeqaaOGaeyypa0Jaam4AaiaacIcacaWGubGaaiykaaaa@486C@ .
  5. The α (thermal diffusivity) is computed with curve fct_IDsph α=k/ρ0Cp with, dEdT=Cp .
  6. Function g(T, E) is similar to the following curve:

    Image15
    Figure 1.
  7. If fct_IDsph ≠ 0,(3)
    Especific=Eintρ0FscaleE MathType@MTEF@5@5@+=feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbwvMCKfMBHbqefqvATv2CG4uz3bIuV1wyUbqedmvETj2BSbqefm0B1jxALjhiov2DaebbnrfifHhDYfgasaacH8akY=xipgYlh9vqqj=hEeei0xXdbba9frFf0=yqFf0dbba91qpepeI8k8fiI+fsY=rqaqpepae9pg0FirpepesP0xe9Fve9Fve9qapdbaGaaiGadiWaamaaceGaaqaacaqbaaGcbaGaamyramaaBaaaleaacaWGZbGaamiCaiaadwgacaWGJbGaamyAaiaadAgacaWGPbGaam4yaaqabaGccqGH9aqpdaWcaaqaamaaliaabaGaamyramaaBaaaleaaciGGPbGaaiOBaiaacshaaeqaaaGcbaGaeqyWdi3aaSbaaSqaaiaaicdaaeqaaaaaaOqaaiaadAeacaWGZbGaam4yaiaadggacaWGSbGaamyzamaaBaaaleaacaWGfbaabeaaaaaaaa@5057@

    T=fsph(Especific)Fscalesph MathType@MTEF@5@5@+=feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbwvMCKfMBHbqefqvATv2CG4uz3bIuV1wyUbqedmvETj2BSbqefm0B1jxALjhiov2DaebbnrfifHhDYfgasaacH8akY=xipgYlh9vqqj=hEeei0xXdbba9frFf0=yqFf0dbba91qpepeI8k8fiI+fsY=rqaqpepae9pg0FirpepesP0xe9Fve9Fve9qapdbaGaaiGadiWaamaaceGaaqaacaqbaaGcbaGaamivaiabg2da9iGacAgadaWgaaWcbaGaam4CaiaadchacaWGObaabeaakiaacIcacaWGfbWaaSbaaSqaaiaadohacaWGWbGaamyzaiaadogacaWGPbGaamOzaiaadMgacaWGJbaabeaakiaacMcacqGHflY1caGGgbGaai4CaiaacogacaGGHbGaaiiBaiaacwgadaWgaaWcbaGaam4CaiaadchacaWGObaabeaaaaa@542E@

    Where, fsph MathType@MTEF@5@5@+=feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbwvMCKfMBHbqefqvATv2CG4uz3bIuV1wyUbqedmvETj2BSbqefm0B1jxALjhiov2DaebbnrfifHhDYfgasaacH8akY=xipgYlh9vqqj=hEeei0xXdbba9frFf0=yqFf0dbba91qpepeI8k8fiI+fsY=rqaqpepae9pg0FirpepesP0xe9Fve9Fve9qapdbaGaaiGadiWaamaaceGaaqaacaqbaaGcbaGaciOzamaaBaaaleaacaWGZbGaamiCaiaadIgaaeqaaaaa@3DC8@ is the function of fct_IDsph.

  8. If fct_IDsph = 0,(4)
    T=Eintsph

    with Sph=ρ0Cp=SpecificHeat MathType@MTEF@5@5@+=feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaam4uaiaadchacaWGObGaeyypa0JaeqyWdi3aaSbaaSqaaiaaicdaaeqaaOGaam4qamaaBaaaleaacaWGWbaabeaakiabg2da9iaadofacaWGWbGaamyzaiaadogacaWGPbGaamOzaiaadMgacaWGJbGaamisaiaadwgacaWGHbGaamiDaaaa@4A44@

  9. If fct_IDT ≠ 0,(5)
    T=f(Time)T0 MathType@MTEF@5@5@+=feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbwvMCKfMBHbqefqvATv2CG4uz3bIuV1wyUbqedmvETj2BSbqefm0B1jxALjhiov2DaebbnrfifHhDYfgasaacH8srps0lbbf9q8WrFfeuY=HhbHc9v8qqaqFr0xb9pg0xb9qqaqFn0dXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpeWZqaaiaaciWacmaadaGabiaaeaGaauaaaOqaaiaadsfacqGH9aqpciGGMbGaciikaiaadsfacaWGPbGaamyBaiaadwgacaGGPaGaeyyXICTaamivamaaBaaaleaacaaIWaaabeaaaaa@4622@

    with Time=TimeFscaleT MathType@MTEF@5@5@+=feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbwvMCKfMBHbqefqvATv2CG4uz3bIuV1wyUbqedmvETj2BSbqefm0B1jxALjhiov2DaebbnrfifHhDYfgasaacH8srps0lbbf9q8WrFfeuY=HhbHc9v8qqaqFr0xb9pg0xb9qqaqFn0dXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpeWZqaaiaaciWacmaadaGabiaaeaGaauaaaOqaaiaadsfacaWGPbGaamyBaiaadwgacqGH9aqpcaWGubGaamyAaiaad2gacaWGLbGaeyyXICTaamOraiaadohacaWGJbGaamyyaiaadYgacaWGLbWaaSbaaSqaaiaadsfaaeqaaaaa@4B57@ ; Eint=Tsph MathType@MTEF@5@5@+=feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqOqFfpeea0xe9vq=Jb9vqpeea0xd9q8qiYRWxGi6xij=hbba9q8aq0=yq=He9q8qiLsFr0=vr0=vr0db8meaabaqaciGacaGaaeqabaWaaeaaeaaakeaacaWGfbWaaSbaaSqaaiGacMgacaGGUbGaaiiDaaqabaGccqGH9aqpcaWGubGaeyyXICTaam4CaiaadchacaWGObaaaa@424B@ .

  10. If fct_IDas ≠ 0,
    (6)
    T=TFscalesph MathType@MTEF@5@5@+=feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbwvMCKfMBHbqefqvATv2CG4uz3bIuV1wyUbqedmvETj2BSbqefm0B1jxALjhiov2DaebbnrfifHhDYfgasaacH8akY=xipgYlh9vqqj=hEeei0xXdbba9frFf0=yqFf0dbba91qpepeI8k8fiI+fsY=rqaqpepae9pg0FirpepesP0xe9Fve9Fve9qapdbaGaaiGadiWaamaaceGaaqaacaqbaaGcbaGaamivaiabg2da9maalaaabaGaamivaaqaaiaadAeacaWGZbGaam4yaiaadggacaWGSbGaamyzamaaBaaaleaacaWGZbGaamiCaiaadIgaaeqaaaaaaaa@4510@

    A=fas(T)FscaleE MathType@MTEF@5@5@+=feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbwvMCKfMBHbqefqvATv2CG4uz3bIuV1wyUbqedmvETj2BSbqefm0B1jxALjhiov2DaebbnrfifHhDYfgasaacH8srps0lbbf9q8WrFfeuY=Hhbbc9v8qqaqFr0xb9pg0xb9qqaqFn0dXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpeWZqaaiaaciWacmaadaGabiaaeaGaauaaaOqaaiaadgeacqGH9aqpciGGMbWaaSbaaSqaaiaadggacaWGZbaabeaakmaabmaabaGaamivaaGaayjkaiaawMcaaiabgwSixlaadAeacaWGZbGaam4yaiaadggacaWGSbGaamyzamaaBaaaleaacaWGfbaabeaaaaa@4A22@ ; B=0 MathType@MTEF@5@5@+=feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamOqaiabg2da9iaaicdaaaa@387E@

    Where, fas MathType@MTEF@5@5@+=feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbwvMCKfMBHbqefqvATv2CG4uz3bIuV1wyUbqedmvETj2BSbqefm0B1jxALjhiov2DaebbnrfifHhDYfgasaacH8srps0lbbf9q8WrFfeuY=Hhbbc9v8qqaqFr0xb9pg0xb9qqaqFn0dXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpeWZqaaiaaciWacmaadaGabiaaeaGaauaaaOqaaiGacAgadaWgaaWcbaGaamyyaiaadohaaeqaaaaa@3D3E@ is the function of fct_IDas.